McJ Tools Reloading M2HSS Outside Diameter Deburring Tool is designed to remove the burrs from the outside of a case mouth; it can be used by hand or attached to DBT base. The Deburring Tool handles all cartridge cases from .17 to .6 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, fit the open end over the mouth to remove exterior burrs. 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.