TUSK HSS Metal Drill Bits are fully ground from a single core of M2 High Speed Steel for perfect balance, maximum strength, heat resistance and maximum life. QC Hex fitting allows for quick and convent changes when using impact wrenches and guarantees stability in the chuck. TiTanium Nitride (TiN) coating for longer life. Increased 135 degree 'split point' or 'self-centering' tip designed to avoid drill walking and enables a faster drilling rate and lower feed pressure. Suitable for alloyed and non-alloyed steel, soft stainless steel, soft cast iron, aluminium, copper, brass, bronze and hard plastics.