McJ Tools Reloading M2HSS Inside Diameter Deburring Tool can be used by hand or attached to DBT base. This Chamferring Tool handles all cartridge cases from .17 to .5 caliber. Most new cases have dents, irregularities and burrs at the mouth of the case. These cases should be sized, expanded and chamfered with a deburring tool. To prepare for accurate bullet seating, insert the pointed end to chamfer the inside the case mouth. Sharp corners that result from trimming a case can be removed quickly and accurately with this tool by using its precision-ground and hardened cutting edges.