Step drill bit kit engineered with cobalt HSS material, for maximum life in stainless steel. Also cuts mild steel, sheet metal, copper, brass, aluminium, fibreglass, plastic, wood, laminates. Dual-flute design cuts fast. Split point tip eliminates walking and penetrates quickly with less force. Steam oxide finish runs cooler and extends the life of the bit. It includes 1/2, 7/8 and 1-1/8 inch step drill bit.