DiamondSure - Bonded Bits Recommended Drill Speed (rpm) Material         Bit Size -->  1/2" 1" 2" 3" 4"  Fiberglass 1200 700 350 250 175  Glass, Ceramic & China 800 500 250 160 125  Limestone & Marble Stone 600 450 225 130 100  Ceramic Wall Tile 600 450 225 130 100  Porcelain Wall Tile 500 375 180 125 90  Porcelain Floor Tile 500 375 180 125 90  Granite Stone 400 300 150 100 75 (Not for use on Concrete or for depths beyond about 1/2") SPEED KILLS:  Reduced drill speeds, low drill pressure and increased use of water lubrication will extend drill bit life considerably.

DT-520   1"   Drill Bit (25.7mm/1.01")    See Detail Page for Pictures & Specs ea  29.956+  26.3614+ 22.4745+ 19.44

DT-546  3-1/2" Drill Bit (89mm/3.51")    See Detail Page for Pictures & Specs ea  85.952+  78.465+  66.9716+  58.44

You’ll get the same dimension you would with a carpenters square, you’ve just got to hold two things at once. For larger spas, have someone help hold everything square while you measure.

--- Item --- Price Qty / Order?   TL-340  1/8" Solid Diamond Tipped DrillOut of Stock - Discontinued                        (Shaft size 1/8") 27.95

DT-528  1-3/4" Drill Bit (44.7mm/1.76')    See Detail Page for Pictures & Specs ea  44.954+  39.9610+ 34.1732+  29.64

DT-560  5" Drill (125mm/4.9")    See Detail Page for Pictures & Specs ea 119.95 2+ 107.964+  90.2712+  78.34

DT-503  1/8" Diamond Tip Drill (3.3mm/.13")    See Detail Page for Pictures & Specs ea  12.9512+ 11.3628+   9.6785+   8.44

DT-524  1-1/4" Drill (32mm/1.26")    See Detail Page for Pictures & Specs ea  33.955+  29.9612+ 25.4738+ 21.94

Diamond Drill Bits, are also know as a Diamond Tip Drill or Diamond Hole Saw.  They are often thought of as a Glass Drill Bit or Tile Drill Bit, but a Diamond Tip Drill Bit is much more versatile since they are used to drill glass, ceramics, porcelain, ceramic tile, porcelain tile, limestone, slate, marble, granite, light stone, and fiberglass.  Water is required for lubrication when drilling.

DT-508  5/16" Drill (8.1mm/.32")    See Detail Page for Pictures & Specs ea  15.959+  13.9624+ 11.9772+ 10.34

Diamond Drill Bitfor grinder

Old fashioned Spear Point carbide bits no longer workon the new type of super-hard floor, counter and wall tiles.Diamond Drill Bits are the solution.

Specifically Designed for Drilling Holes In     Glass Marble Limestone Slate   Glass Jars Ceramics Porcelain Granite   Stained Glass Ceramic Tile Porcelain Tile Stone   (Designed for materials to about 1/2" Thick)

IMPORTANT Diamond drill bits require the use of proper lubrication, correct drill speed and proper pressure.  Drilling methods and techniques vary significantly depending upon the material being drilled. Not for use on Concrete or with Hammer-Impact Drills, or for depths beyond about 1/2" Please See: Drilling Tips & Techniques

These solid point bits are not designed for as a Tile Drill Bit and should not be used for drilling porcelain tile, floor tile, limestone, slate, marble, granite or other stones.  Glastar Blunt Nose Drill Bits are designed to be used at high speeds up to 10,000 rpm.

Old fashioned Spear Point carbide bits no longer workon the new type of super-hard floor, counter and wall tiles.Diamond Drill Bits are the solution.

DT-521  1-1/8" Bit (28.8mm/1.13")    See Detail Page for Pictures & Specs ea  30.956+  27.2614+ 23.2745+ 20.14

Hollow CoreDiamond drillBits

DT-507  1/4" Diamond Bit (6.5mm/.26")    See Detail Page for Pictures & Specs ea  14.9510+ 13.1624+ 11.2772+   9.74

Do you have a special situation that makes measurement difficult? We’d love to hear from you! Give us a call or shoot us an E-Mail. We’ll make sure you’ve got everything just right.

We have excellent Print & Measure Sheets on our Spa Covers Page, but many people get tripped up on measuring the corner radius. Fortunately, you don’t need to be a master of geometry to get it right the first time.

DT-526  1-1/2" Drill Bit (38.4mm/1.51")    See Detail Page for Pictures & Specs ea  39.954+  35.5610+ 30.3732+ 26.34

DT-565  5"-1/2 Diamond Bit (140mm/5.51")    See Detail Page for Pictures & Specs ea 129.95 2+ 119.96 4+  114.2712+  89.34

DT-502  5/64" Diamond Bit (2.0mm/.08")    See Detail Page for Pictures & Specs ea  11.9512+ 10.5630+   8.9790+   7.74

DT-556  4-1/2" Diamond Bit (115mm/4.52")    See Detail Page for Pictures & Specs ea 109.95 2+ 99.964+  83.2713+  69.34

If only it were that easy! Spa manufacturers are notoriously secretive about their product specifications because they only want you to buy direct or through their dealers. On a cover, that can add hundreds of extra dollars to the cost.

Best1 2 diamond drill bit

DT-517  5/8" Drill (16.1mm/.63")    See Detail Page for Pictures & Specs ea  21.957+  19.3618+ 16.4755+ 14.24

Place the straight edge against the rim, extending it past the curve. Now, measure from the straight edge to where the curve straightens out.

Blunt Nose Diamond Tip Drill Bits work with any drill - just add water for lubrication.  Glastar brand drill bits are much easier and safer to use than old-fashioned spear point steel drills and don't chip the work material.  Blunt Nose Drills are primarily a Glass Drill Bit, for use on glass, stained glass, china plates or fiberglass.

Diamond Drill & ToolOmaha, Nebraska Also See: Contact Information © Copyright Diamond Drill Bit & Tool 1998-2021.  All website content, images, pictures, graphics, design, wording and scripts, are the exclusive registered property of Diamond Drill Bit & Tool. See Copyright Information Site Index   |   Contact Us   |    Privacy.

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I get a lot of questions when it comes to measuring hot tubs for a new cover. And why not? They’re expensive and you want to make sure everything is correct.

DT-536  2-1/2" Bit (63.9mm/2.51")    See Detail Page for Pictures & Specs ea  59.953+  53.966+  46.1720+  40.24

DT-525  1-3/8" Drill Bit (35mm/1.38")    See Detail Page for Pictures & Specs ea  36.955+  32.8612+ 27.9738+ 23.44

Go to top of PgReturn to Previous Section Half-Circle shaft profileshown in lower left of picture. Diamond File General Purpose File With 'Half-Circle' Shaft Profile Diamond coated file is 7" long with "half-circle" shaft.  A perfect general purpose file for use on flat, rounded or curved edges.  Use on glass, stained glass, ceramic, marble, stone, fiberglass or plastic.  Blade of file is 3/8" wide, tapering to a point.  Perfect for filing off sharp edges, reshaping cuts or reaming drilled holes.  Handle is vinyl coated for safety and comfort.DF-151  7" Diamond 'Half-Circle' File ........... ea 12.95 / 3+ 11.63 / 8+ 9.29                                  Sorry - Out of Stock

You’ll get the most accurate results measuring the spa shell instead of the old cover for a couple of reasons. First, covers are manufactured slightly larger than the specified measurements (up to an inch). Second, covers relax and deteriorate over time, making them harder to measure correctly.

Diamondtipdrill bitfor metal

No carpenters square? No problem. Grab a straight edge (a broomstick or yardstick works well) and a tape measure or ruler.

Not only will it look weird, but you’ll be constantly running into it as you walk around the spa, which risks damaging the cover. Additionally, this overhang won’t be supported by the spa shell, risking foam core breakage.

You Are Here:  DD&T Home Page > Drill Bits Section Page > Glass Drill Bit / Tile Drill Bit

DT-540  3" Diamond Hole Saw (76.5mm/3.01")    See Detail Page for Pictures & Specs ea  74.952+  67.465+  57.7716+  50.34

A smaller radius simply extends the cover beyond the corner of the tub. A radius that’s too large and the cover will not extend enough to cover the corner.

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× Home About DD&T Privacy/Security Contact Us Shipping Info Delivery Map Diamond Drills Diamond Files Diamond Grinder Diamond Saws Grinder Acc Saw Accessories Miscellaneous Drilling Tips Site Index Prior Page 30+ Years Experience with Diamond Tools!

DT-516  1/2" Diamond Bit (12.9mm/.51")    See Detail Page for Pictures & Specs ea  18.958+  16.7620+ 14.2764+ 12.34

Diamond Drill Bitsizes

IMPORTANT Diamond drill bits require the use of proper lubrication, correct drill speed and proper pressure.  Drilling methods and techniques vary significantly depending upon the material being drilled. Not for use on Concrete or with Hammer-Impact Drills, or for depths beyond about 1/2" Please See: Drilling Tips & Techniques

DT-550  4" Diamond Hole Saw (102mm/4.02")    See Detail Page for Pictures & Specs ea  98.952+  89.965+  77.2715+  67.34

Hole Saw style drill bits have a hollow center and cut a circle in the material to create a hole. This results in a hole the size of the bit and a smaller "plug" or "core" which comes from the center.  They are sometimes referred to as a Core Drill Bit, however, technically core drill bit sizes relate to the size of the core, not the hole size.  The Drills are available below in sizes from 5/64" to 5-1/2" (outside diameter).  The metric manufactured size of each bit is also shown below (mm), along with the exact inch measurement of each bit.

The short answer is no, but it’s worth it to take a radius measurement if your tub has curved corners. Say your tub has a 10” corner radius and you go with a zero radius cover. You’re going to have 5” of cover overhanging each corner.

DT-518  3/4" Drill Bit (19.3mm/.76")    See Detail Page for Pictures & Specs ea  24.957+  21.9616+ 18.7750+ 16.24

Since Glastar Diamond Tip Drill Bits have a solid rounded tip, they are slightly easier to start when drilling on a curved surface, such as a bottle, when compared to using a Core drill bit, above.  However, since solid tip drill bits drill out the complete hole, they also drill more slowly than the hollow core style bits and they are generally not used on the super hard abrasive materials such as ceramic tile, porcelain tile, floor tile, limestone, slate, marble, granite or other stones.  Hollow core style drill bits are recommended for drilling in these very hard materials and are available from 1/8" to 4" in the section, above.  See also How to Use Diamond Bits.

That may seem counterintuitive, but think about it this way: a perfectly squared cover will have a 0” radius. That would definitely cover any curved corner, it just might look a little weird.

Drill bit Diamondtip

DT-515  3/8" Diamond Tip Bit (9.7mm/.38")    See Detail Page for Pictures & Specs ea  16.959+  14.9622+ 12.7768+ 10.94

Diamond coated file is 7" long with "half-circle" shaft.  A perfect general purpose file for use on flat, rounded or curved edges.  Use on glass, stained glass, ceramic, marble, stone, fiberglass or plastic.  Blade of file is 3/8" wide, tapering to a point.  Perfect for filing off sharp edges, reshaping cuts or reaming drilled holes.  Handle is vinyl coated for safety and comfort.DF-151  7" Diamond 'Half-Circle' File ........... ea 12.95 / 3+ 11.63 / 8+ 9.29

All these drill bits have shaft sizes of 3/8" or less, for use in standard drills.  For detailed drill bit size information (total length, shaft length, bell length, etc) - Click on the Detail Page link for each drill bit listed below.

Go to top of PgReturn to Previous Section                   Solid Diamond Tip Drill Bit Electroplate Bonded Solid Diamond Tip Drill Bit For drilling glass, stained glass, china plates & fiberglass! Blunt Nose Diamond Tip Drill Bits work with any drill - just add water for lubrication.  Glastar brand drill bits are much easier and safer to use than old-fashioned spear point steel drills and don't chip the work material.  Blunt Nose Drills are primarily a Glass Drill Bit, for use on glass, stained glass, china plates or fiberglass. These solid point bits are not designed for as a Tile Drill Bit and should not be used for drilling porcelain tile, floor tile, limestone, slate, marble, granite or other stones.  Glastar Blunt Nose Drill Bits are designed to be used at high speeds up to 10,000 rpm. Since Glastar Diamond Tip Drill Bits have a solid rounded tip, they are slightly easier to start when drilling on a curved surface, such as a bottle, when compared to using a Core drill bit, above.  However, since solid tip drill bits drill out the complete hole, they also drill more slowly than the hollow core style bits and they are generally not used on the super hard abrasive materials such as ceramic tile, porcelain tile, floor tile, limestone, slate, marble, granite or other stones.  Hollow core style drill bits are recommended for drilling in these very hard materials and are available from 1/8" to 4" in the section, above.  See also How to Use Diamond Bits. --- Item --- Price Qty / Order?   TL-340  1/8" Solid Diamond Tipped DrillOut of Stock - Discontinued                        (Shaft size 1/8") 27.95

Glass Drill Bit / Tile Drill Bit / Diamond Tip Drill Bit Measurements Shown Below are Outside Diameter (Click on individual drill bit pictures for detailed specifications) --- Item ---   Price   Qty / Order? 5/64"   1/8"   3/16"   1/4" DT-502  5/64" Diamond Bit (2.0mm/.08")    See Detail Page for Pictures & Specs ea  11.9512+ 10.5630+   8.9790+   7.74

Material Drill Head Pressure *  Fiberglass 10 to 15 lbs.  Limestone & Marble Stone 12 to 18 lbs.  Glass, Ceramic & Porcelain China 12 to 18 lbs.  Ceramic or Porcelain Wall Tile 15 to 20 lbs.  Porcelain Floor Tile 18 to 30 lbs.  Granite Stone 18 to 30 lbs. * WARNING:  Drill press arm leverages hand pressure by a factor of about 6 to 8.  So 2 lbs. of hand pressure on the drill press arm will apply about 14 lbs of pressure to the drill head.

DT-505  3/16" Drill (4.9mm/.19")    See Detail Page for Pictures & Specs ea  13.9510+ 12.2626+ 10.4780+   9.14

Not sure what type drill bit you need? Check out our Drill Bit Section Summary Page!

DT-538  2-3/4" Drill Bit (70mm/2.76")    See Detail Page for Pictures & Specs ea  66.953+  60.266+  51.5720+  44.84

The easiest way to measure a corner radius is with a carpenter square. Simply place the square against the outside rim of the spa in the corner. The point on the inside of the framing square where the corner curve first touches the square is the corner radius. Easy!

Need Express Delivery?         Not sure what type drill bit you need? Check out our Drill Bit Section Summary Page! Diamond Drill Bit Tile Drill Bit, Glass Drill Bit Diamond Tip Drill Bit, Diamond Hole Saw Specifically Designed for Drilling Holes In     Glass Marble Limestone Slate   Glass Jars Ceramics Porcelain Granite   Stained Glass Ceramic Tile Porcelain Tile Stone   (Designed for materials to about 1/2" Thick) Electroplate Bonded Diamond Tip Drills Diamond Drill Bits, are also know as a Diamond Tip Drill or Diamond Hole Saw.  They are often thought of as a Glass Drill Bit or Tile Drill Bit, but a Diamond Tip Drill Bit is much more versatile since they are used to drill glass, ceramics, porcelain, ceramic tile, porcelain tile, limestone, slate, marble, granite, light stone, and fiberglass.  Water is required for lubrication when drilling. Old fashioned Spear Point carbide bits no longer workon the new type of super-hard floor, counter and wall tiles.Diamond Drill Bits are the solution. Hole Saw style drill bits have a hollow center and cut a circle in the material to create a hole. This results in a hole the size of the bit and a smaller "plug" or "core" which comes from the center.  They are sometimes referred to as a Core Drill Bit, however, technically core drill bit sizes relate to the size of the core, not the hole size.  The Drills are available below in sizes from 5/64" to 5-1/2" (outside diameter).  The metric manufactured size of each bit is also shown below (mm), along with the exact inch measurement of each bit. Diamond bits are easy to use, however, there are many special techniques which are different from standard steel-bit drilling.  Usage can also vary depending upon the type and the specific manufacturer.  To assist our customers, we have compiled an extensive and detailed Drilling Tips & Techniques section. .       Recommended Drill Speeds DiamondSure - Bonded Bits Recommended Drill Speed (rpm) Material         Bit Size -->  1/2" 1" 2" 3" 4"  Fiberglass 1200 700 350 250 175  Glass, Ceramic & China 800 500 250 160 125  Limestone & Marble Stone 600 450 225 130 100  Ceramic Wall Tile 600 450 225 130 100  Porcelain Wall Tile 500 375 180 125 90  Porcelain Floor Tile 500 375 180 125 90  Granite Stone 400 300 150 100 75 (Not for use on Concrete or for depths beyond about 1/2") SPEED KILLS:  Reduced drill speeds, low drill pressure and increased use of water lubrication will extend drill bit life considerably. . Because these drill bits are used to drill in extremely hard materials, it is very important to use proper drill pressure to keep from overheating the bit.  Excessive pressure is merely converted to heat energy and can burn up a bit very quickly. .           Recommended Drill Head Pressure Material Drill Head Pressure *  Fiberglass 10 to 15 lbs.  Limestone & Marble Stone 12 to 18 lbs.  Glass, Ceramic & Porcelain China 12 to 18 lbs.  Ceramic or Porcelain Wall Tile 15 to 20 lbs.  Porcelain Floor Tile 18 to 30 lbs.  Granite Stone 18 to 30 lbs. * WARNING:  Drill press arm leverages hand pressure by a factor of about 6 to 8.  So 2 lbs. of hand pressure on the drill press arm will apply about 14 lbs of pressure to the drill head. All these drill bits have shaft sizes of 3/8" or less, for use in standard drills.  For detailed drill bit size information (total length, shaft length, bell length, etc) - Click on the Detail Page link for each drill bit listed below. IMPORTANT Diamond drill bits require the use of proper lubrication, correct drill speed and proper pressure.  Drilling methods and techniques vary significantly depending upon the material being drilled. Not for use on Concrete or with Hammer-Impact Drills, or for depths beyond about 1/2" Please See: Drilling Tips & Techniques

DT-534  2-1/4" Drill (57mm/2.25")    See Detail Page for Pictures & Specs ea  56.953+  51.267+  43.8724+  38.24

DT-519  7/8" Drill (22mm/.87")    See Detail Page for Pictures & Specs ea  26.956+  23.7614+ 20.1745+ 17.54

DT-530  2" Diamond Hole Saw (51.1mm/2.01")    See Detail Page for Pictures & Specs ea  51.953+  46.268+  39.4725+  34.34