Neilsen External Chamfer Deburring Remove Tool 3mm - 19mm Drill Bit 1/4" Rotary De-burring / Chamfer Tool / 3 - 19mm 3 - 19mm External Chamfer De-Burring Tool For cleaning and repairing threaded fasteners and studs quickly and safely. Fitted with 3 x YG8 blades to remove damaged metal and burrs. Features a 1/4in. hex shank for use with a drill or hex driver. Suitable for use with a variety of materials including stainless steel hardened steel / mild steel / copper / brass / plastic etc. Units is much faster and more accurate than using a file or angle grinder.