Learning how to sharpen drill bits is cost effective, it better to keep a bit sharp by occasional sharpening rather than waiting until it becomes really blunt. A sharp bit cuts better with less effort whether used in a power or hand drill. A sharp bit will also give a cleaner hole.

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Also known as a wood or dowel bit, they have a central point and two raised spurs that help keep the bit drilling straight. The bit cuts timber very fast when used in a power drill and leaves a clean sided hole. They are ideal for drilling holes for dowels as the sides of the holes are clean and parallel. Sizes range from 3 to 10mm. Spur point bits should only be used for drilling wood or some plastics.

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The larger bits require a fairly powerful drill to bore deep holes. The bits cause a lot of splintering as they break out the back of the workpiece - using a sacrificial backing board will reduce this. Flat wood bits are not really suitable for enlarging an existing hole.

Usually referred to as twist drills, twist bits are probably the most common drilling tools used by the handyman with either a hand or electric drill. The front edges cut the material and the spirals along the length remove the debris from the hole and tend to keep the bit straight.

Sharpening - difficult because of the hard tungsten carbide and curved cutting edge. With care and patience, a blunt edge can be made good using an oilstone.

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This is ideal when drilling large-diameter, deep holes in wood or thick man-made boards. Generally an Auger bit should only be used in a hand brace. The bit will cut a clean and deep, flat bottomed holes. The single spur cuts and defines the edge of the hole while the chisel-like cutting edge removes the waste within the previously cut circle. The threaded centre bites into the wood and pulls the bit into the timber. This 'pulling' action means that the bit is really unsuitable for use in a power drill.

With their central point and two spurs, Bullet drills resemble spur point bits, but can be used in metal, wood and plastics. Unlike normal twist drills, the twisted flutes are ground away; making a truer, more accurate bit than normal twist bits. They cut a clean hole and cause little damage when they break through the back of the workpiece.

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Masonry drills are usually used in a power drill; although they can be used with a lot of effort in a hand brace. Most masonry bits can be used with a hammer action power drill, but always check as the action is quite punishing on the bit and cheaper bits have been known to shatter when subjected to the pounding. Always use a slow rotational speed for drilling into harder materials to avoid overheating the tip, and frequently withdraw the bit to remove dust.

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A bit for drilling ceramic tiles and glass, it has a ground tungsten carbide tip. They can be used with a hand drill, but are best used in a variable speed power drill on a slow speed. When drilling glass, some form of lubricant (i.e. turpentine or white spirit) should be used to keep the tip cool.

It is generally known that machining tungsten carbide or grinding carbide blanks with through-tool spiral cooling channels represent a special challenge. Mikron Tool has specialized in grinding the carbide raw material in such a way that the tool is not weakened and remains stable despite the internal cooling channels.

Although not a true 'drill', it is used in a power or hand drill to form the conical recess for the heads of countersunk screws. These bits tend to be designed for use on soft materials such as timber and plastics, not metals. When used with a power drill to counter sink an existing hole, the bit tends to 'chatter', leaving a rough surface. Better results be will obtained if the countersink bit is used before the hole is drilled, then take care to ensure that the hole is in the centre of the countersunk depression.

To be able to machine nonferrous metals as well as high-quality and difficult materials successfully with CrazyDrill Cool, the small drill is available with or without coating depending on need. For example, the uncoated variant of this through coolant drill is best suited for drilling alumimum.

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Many jobs around the house require a hole of some kind to be drilled - whether it is putting up a shelf, building a cabinet or hanging a light fitting.

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These high-grade blanks with through-tool cooling channels are used when manufacturing CrazyDrill Cool. Drill regrinding and recoating are possible from a drill size diameter of 1.4 mm (.055”) and increase the cost-effectiveness of this tool.

Titanium nitride bits cannot be sharpened without destroying the coating (although if the drill needs sharpening, the coating will probably have already been destroyed). Forming the correct angle at the tip is important for efficient cutting.

Used to form holes with a flat bottom, such as for kitchen cupboard hinges. Best used in a power drill held in a drill stand as there's little in the way of a central point. If used freehand, the positioning is difficult to control as there is no central pilot bit.

For basic requirements, a set of high-speed steel twist drills and some masonry bits will probably be sufficient for the average handyman. But for more sophisticated jobs/material, others bits will be required - perhaps larger, or designed for a specific material/purpose.

Smallest drillbit size in mm

CrazyDrill Cool can replace expensive deep-hole drilling (for example with gun drilling machine) up to a depth of 15 x d in the drill size diameter range of 0.75 mm to 6 mm (.030” - .236”, coated version in fractional inches available). Greater productivity is thus reached without having to invest in expensive manufacturing systems. Thanks to the high surface quality further finishing processes such as reaming are often not necessary..

Countersinks are available with fitted handles so that they can be used by hand twisting, often easier than changing the bit in the drill when only a relatively few holes need countersinking.

Like the Hole Saw above, these combination saws can cut large holes but they consist of a number of different sized round saw blades, usually ranging from about 25 to 62mm in diameter. Normally the blade are secures by a radial screw in the 'head', all blades other than the desired sized being removed before the screw is inserted to secure the required diameter blade. Best used in a power drill at low speed as the blade saws it's way through the material.

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As the name suggests, these are designed for drilling into brick, block, stone, quarry tiles or concrete. The cutting tip is often made from tungsten carbide bonded to a spiralled steel shaft. Some masonry drills are described as 'durium tipped', this term refers to a highly durable silicon bronze alloy used instead of tungsten as the cutting point.

The small drill with through-tool cooling CrazyDrill Cool from Mikron Tool also resolves drilling problems in difficult-to-machine materials. The combined use of a pilot drill (solid carbide drill bits CrazyDrill Pilot or  CrazyDrill Crosspilot) and the small drill with through-tool cooling CrazyDrill Cool allows drilling depths of up to 15 x d (other standard lengths: 6 x d and 10 x d) and this in drill size diameter ranges of 0.75 mm to 6 mm (.030” - .236”, coated version in fractional inches available). A shaft-integrated power chamber (up to a drill diameter of 2.95 mm / .116”) allows a more efficient coolant supply directly to the drill tip results in higher drilling speeds and tool life. A double advantage! In addition, the drilling concept of the CrazyDrill Cool is an alternative to the long and costly deep-hole drilling methods using single-lip drills (gundrill).

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CrazyDrill Cool is used everywhere where long drills are needed to create deep and accurate holes. The drilling concept from Mikron Tool is especially designed for deep holes and is based on a two-stage principle. Centering and pilot drilling is carried out in one step with two types of drill bits: CrazyDrill Pilot or CrazyDrill Crosspilot. CrazyDrill Cool then reaches the maximum drilling depth in one or more pecks (depending on material).  By means of fine-tuned tolerances the long drill is not only guided very well in a cylindrical bore but also produces a hole with the best quality. On inclined surfaces the combination with CrazyDrill Crosspilot works best allowing center drilling with an inclination angle of up to 60°.

Twist drills are usually available in sizes 0.8-12 mm plus. They are designed for drilling relatively small holes, they sometimes tend to clog quickly especially when the wood is 'green' so when drilling deep holes (especially in hardwood) the bits should be withdrawn regularly to remove the waste.

Twist bits are also available coated with Titanium nitride (TiN), these are easily identified by the gold like colour. This coating increases the hardness of the bit and adds a self-lubricating property. The coating is only really effective when metal is being drilled, it has little effect when working with other materials.

Sharpening - a bit fiddly as it has to be done by hand. Sharpen the point and spurs with a fine file or edge of a fine grindstone; the angle between the point and spurs should be 90°.

Special care is required when using the smallest sizes since these bits are thin and brittle. Always hold the drill square to the work and apply only light pressure when drilling.

Two spiral cooling channels leading up to the drill tip supply the cutting edges with coolant even at lower pressure due to the power chamber in the shaft (up to a drill diameter of 2.95 mm / .116”). Oil volume that is three times greater flows through the shaft at the same pressure, allowing high drilling speeds and guarantees better tool life and more efficient chip removal.

Smallest Drillbit

The special cutting geometry of CrazyDrill Cool affords optimal chip flow. The need to remove chips depends on the material to be machined and the drilling depth (see cutting data chart). A clearly defined drilling process allows a high degree of process reliability which combined with fast drilling speeds produce time-savings compared to conventional tooling.

Used for cutting large, fixed, diameter holes in wood or plastic. They will usually cut up to a depth of 18mm - deeper versions are available. Best used in a power drill at low speed as the blade saws it's way through the material.

Intended for power drill use only, the centre point locates the bit and the flat steel on either side cuts away the timber. These bits are used to drill fairly large holes and they give a flat bottomed hole (with a central point) so are ideal where the head of a screw/bolt needs to be recessed into the timber - always use this bit before drilling the clearance hole for the bolt.

The lower limit is "0", The upper limit calculation formula 2+TD2 is the basic size + tolerance. Example M8-6H internal thread pitch diameter is: 7.188+0.160 ...

These combination bits are quite clever, they drill the clearance hole and countersinks it all in one stroke. Can be used in a power drill or some routers. Different bits are required for different size of clearance holes and they are probably not cost effective unless a large number of a given hole size need to be drilled and countersunk.