M2 HSS, black oxide finish Black oxide steam-tempered coating aids chip flow and heat dissipation Crankshaft split point for fast, accurate starting
Black Knight M2-HSS Twist Drills. Black Finish Twist Drills (also called blue finish) achieve their distinctive colour by steam tempering, a thermal process resulting in a porous tool coating. 118 point angles are ideal for use in materials such as mild steel and cast iron.
