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):4.04Blade Length (mm):40Total Length (mm):80Shank Diameter (mm):4.04Corner opposite side (mm):3.2High Speed Steel (HSS)