Forster Chamfers case mouths to remove dents irregularities and burrs.. 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 DBT 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. Specifications for Forster Chamfers: Manufacturer: Forster Quantity: 1 Package Contents: Forster Chamfers Forster DB1000: Chamfers case mouths to remove dents irregularities and burrs.