Step Twist Drill Calibrated for 20 Gauge Wire 

A handy step drill for the most common wire gauges. Calibrated for 20 gauge round wire. Works with a H.30 Foredom Handpiece or the H.20 Quick Change. Let the bit do the work by allowing the drill bit to spin first. Make a quick dent with a hammer and nail and off you go! Hardened tool steel step drill with 3/32" shank and overall length of 1.8" (45mm), .9mm/.0354" head diameter, 8.5 head length or drilling depth.

Jewelers most often use the twist drill bit with a Jacobs-style handpiece, the jaws of which can tighten around the bit's shaft and hold it securely. Step-down bits, however, have a 3⁄32 inch (2.35 millimeter) shaft that’s designed specifically for the quick-release handpiece, which has a collet of a corresponding size. Because of the difference in size between the 3⁄32 shank and the actual bit, care must be taken to ensure that the drilling is straight, or the cutting area of the bit will snap off.

Use for drilling all types of wood, precious metals, mild steel, bone and mother of pearl. Made in Switzerland. 30,000 RPM Max Speed. Hardened tool steel step drill with 3/32" shank and overall length of 1.8" (45mm), .6mm/.0236" head diameter, 8.5 head length or drilling depth.  Made in Switzerland. 30,000 RPM Max Speed.

See handy Tips, Tricks and Advice on the Flex-shaft