... ,plenty experience timely delivery ISO9001 HSS STRAIGHT SHANK TWIST DRILL BIT,DIN338, BLACK OXIDEHot rolled flute, ... speed steel.Coating is very hard giving very long drill bit life, up to 8 times. ... 30mm 21 PCS TITANIUM NITRIDE COATED COMPLETE GROUND TWIST DRILLS SETSPECIFICATION (inch):1/16 5/64 3/ ... -25/32" .HSS SAW DRILL BITMulti function bit drills, saws, and reams brass, aluminum, wood and plastics ...