Has loose chamfer angles and a shank rectangle part, and precisely finishes the hole after passing the drill hole and the rough reamer.Work material: Cast iron, carbon steel, alloy steel, tool steel, stainless steel, aluminum alloy.Number of Blades:6Cutting Diameter (mm):7.20Blade Length (mm):55Total Length (mm):110Shank Diameter (mm):7.20Corner opposite side (mm):5.6High Speed Steel (HSS)