They have a black oxide surface treatment that is abrasion resistant, reduces chip welding and improves chip flow. The 135 degree split point is self-centering and reduces thrust..
Gold and black surface treated for use in stainless steel and other hard metal drilling.50mm HSS Black & Gold KFD Split Point Jobber Length Drill Bit Killer Force Drills (KFD) have a heavy duty 135 degree split point for self-centering and reducing thrust..10.
This Crescent 3/8 inch Drive Socket Rail made from chrome vanadium steel alloy, specially formulated and heat-treated for high strength and superior resistance to abrasion and corrosion.