For drilling holes in carbon steel, stainless steel, cast iron, brass, aluminum, and wood. Made of strong, break-proof, and stable material to create breakthroughs. Right-hand cutting with variable tooth pitch (4/6 tooth) for high concentricity accuracy and good chip removal. Suitable for use with cordless or electric hand drills and compatible with holesaw attachment bracket, with pilot drill (BGS 50399). Cutting depth up to a maximum of 40 mm. Maximum drive speeds: carbon steel 130 r.p.m., stainless steel 65 r.p.m., cast iron 85 r.p.m., brass 170 r.p.m., aluminum 195 r.p.m., and wood 1800 r.p.m.