This superior quality external deburr/chamfer tool makes light work of repairing damaged bolts and chamfering metal bar. Designed to be used with an electric drill, this professional tool has a 1/4†quick-chuck shaft for easy bit changes. The perfect tool to chamfer damaged wheel studs, a common issue when removing and replacing a wheel, a quick chamfer from the tool and this problem is overcome. Fitted with three super-hard HSS blades for a clean, smooth cut in a wide range of materials including stainless steel, hardened steel, mild steel and hard plastic. Use on lower speed settings for the best results (max. recommended speed is 400rpm). Covers all sizes of bolts, studs and threaded rod diameters from 3mm to 19mm. The instant solution for repairing hammer-damaged, squashed or flattened threads, this is a real problem solver in the workshop.