12 High Speed Twist Drill Bits & Handle Great for Metalsmiths, Metal Working & Drilling. This is a new set of 12 high speed steel twist drill bits and handle. Great for drilling ferrous metals, tough casting sand forgings, working hardened stainless steel and other hard steels and tough high tensile strength nonferrous metals like titanium. Made of rust free aluminum, except for the chuck which is made of black oxide tool steel. The handle has a pocket clip that prevents rolling and is well knurled for a perfect grip. Drill bits can be stored in the handle. The handle measures approximately 3 13/16 x 7/16 (97 x 11 mm). These bits measure from approximately 0.0135 to 0.0635 (0.34 to 1.61 mm).