TUSK HSS DRILL BITA are constructed of M2 High Speed Steel for the best combination of strength, heat resistance and wear resistance. Great general purpose drill bits to suit a builder, electrician, plumber or DIV handyman to deal with timber, aluminum or steel. Fully ground HSS drill bits feature a Titanium Nitride (IiN) gold coating for long life with an increased 135 degree point enabling a faster drilling rate, lower feed pressure and features a ‘split point’ or ‘self centering’ tip.