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A solid carbide twist drill is perfect for delicate drilling through hard materials for model engineering, archaeology and scientific laboratory work.

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Read on for further information, including cutting lengths, spindle speeds, feed rates, and chip loads for drill bit sizes.

Look at the different drill bit sizes of carbide micro drills to determine their effective cutting length, spindle speed, feed rate and chip load.

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Extra care is needed with handling these drills as they are very delicate, especially sizes from 0.1mm - 0.4mm. Make sure everything is running true without any lateral movement.

Ideal for drilling through PCB, and printed circuit boards. Made of fibreglass, printed circuit boards require a tough micro drill, and our tungsten carbide drills range will outperform similar HSS drill bits.

The drill size chart provides a list of standard size drill bits in several measurement systems, including fractional, metric, wire gauge number, and letter. The decimal equivalents of the diameters are shown in both English and Metric units. Fractional sizes are measured in inches, while metric sizes are measured in millimeters. The wire gauge and letter systems refer to tool diameters that increase as the wire gauge decreases from #107 to #1 and then continues from A to Z. The drill size chart contains tools up to 1.5 inches in diameter, but larger tools are also commonly used.

Most horologists find the easiest way to use these micro drill bits is by first finding the centre with a graver and then holding a micro drill in a pin-vice and then taking them to the work. Use very light pressure whilst taking the drill in and out periodically. No lubrication is necessary, although a small dab of oil can help.

These hard, solid tungsten carbide micro twist drill bits, versatile in their application,  are excellent for producing smooth, precision holes and drilling through all hard metals. Ensure a steady hand when using these micro drill bits, ideally used at high speed in a pillar drill.