... strict quality control advanced equipment,plenty experience timely delivery ISO9001 HSS STRAIGHT SHANK TWIST DRILL BIT,DIN338, BLACK OXIDEHot rolled flute ... use in metal, wood and plasticsSize:17/64" -25/32" .HSS SAW DRILL BITMulti function bit drills, saws, and reams brass ... in steel, alloyed steel, all common working steels.High performance HSS special drill bit with morse taper shank for high precise ...