Cobalt #3 Step Bit. Engineered with Cobalt HSS material, for maximum life in stainless steel. Also cuts mild steel, sheet metal, copper, brass, aluminum, fiberglass, 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. Designed and manufactured in the USA.