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. The Forster Inside-Outside Deburring Tool is a double-ended, multi-function piece of equipment that can be used by hand, by lathe, or attached to the special Deburring Tool Base (sold separately).

The Inside-Outside Deburring Tool handles all cartridge cases from .17 to .45 caliber. To prepare for accurate bullet seating, insert the pointed end to chamfer the inside of the case mouth. 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.