Professional tungsten carbide burrs for commercial or occasional use. Suitable for use in dies grinders, routers etc... with a 1/4" collet. Ideal for removing material when porting, general shaping, cleaning up castings etc... Precision machined for good balance with double diamond cut cutting faces. High grade tungsten carbide. 1/4" plain shank. 65mm Total Length. Suitable for grinding most steel types, glass, plastics, marble, granite and various other materials Includes; (style as pictured) 1pc 12mm diameter parallel burr. 2pc 12mm diameter parallel burr with ball end.