Bosch Metal Drill Bit is made with HSS-Co Cobalt alloy This precision drill bit with professional use quality is resistant to heat and wear The metal drill bits are suitable for use on alloyed and non-alloyed steel, stainless steel, cast iron, cast steel, acid and heat-resistant steels and ideal for drill stands or pillar drills Compatible with Black+Decker, Bosch, Makita, Metabo, Skil