This external chamfer deburring tool is manufactured with three hardened cemented carbide blades. Designed for repairing bolt threads and studs and chamfering metal bars/pipes. For use on hardened steel, mild steel, stainless steel, brass, copper, wood and hard plastics. Fitted with a quick change 1/4″ hex. shank. Suitable for drill drivers and drills with a standard 10/13mm chuck.