BlueSpot External Chamfer/deburring Tool (13-36mm) The Blue Spot Tools External Chamfer/Deburring Tool (13-36mm) is used to clean and repair damaged threads and studs between 13-36mm. The blades are manufactured from Tungsten Carbide which is extremely hard wearing and has a very high melting point (2,600?) making it ideal for cleaning threads studs. For use on stainless steel, hardened steel, mild steel, copper, brass, fibreglass, hard plastic and more. Ideal for use with electric drills. Tungsten Carbide blades make it ideal for cleaning threads studs Used to clean and repair damaged threads and studs between 13 - 36mm For use on stainless steel, hardened steel, mild steel, copper, brass, fibreglass, hard plastic and more Ideal for use with electric drills Chamfer angle: