Quick Change Carbide Cutter Kit, 8 Piece Complete Solutions for 1/2" to 2" conduit. Fast, accurate holes in stainless steel, mild steel, iron, copper, brass, aluminum, fiberglass and plastic sheet. Extends tool life with reduced friction, torque and heat. Split point, cobalt-steel pilot drill eliminates walking and penetrates quickly. Precision engineered, tungsten carbide teeth for fast cutting of round, burr-free holes. Optimized carbide placement reduces friction and torque requires less force and generates less heat while cutting. Flange Stop for Safety prevents over-drilling. Ejector Spring automatic slug removal with every cut.