TEMO SB-3L6 Double Cut CARBIDE Rotary BURR FILE, 3/8 inch (9.5mm) HEAD Cylinder End Cut, 1/4 inch (6.35mm) Diameter 6 inch (152mm) Long Shank double cut SB-3L6 Cylinder Head Shape They have double cut head with 1/4" (6.35mm) shank and 3/8" (9.52mm) head diameter. Burrs are made with tungsten carbide and are suitable for deburring and polishing cast iron, cast steel, carbon steel, alloy steel, stainless steel and other materials up to HRC65 hardness. Packaged in a clear plastic tube 6" shank length, 7" total length.