The Forster Primer Pocket Cleaner helps to ensure consistent ignition and reduce the incidence of misfires by removing powder and primer residue from the primer pockets of used brass cases. Requires the Primer Pocket Center (sold separately) to support the case mouth. Notes:Primer pocket cleaner is used with primer pocket center (pn 628-603).Cleaner and center are attached to Forster original, classic or power case trimmer.Large cleaner (pn 628-580) is for use with .210" primers.Small cleaner (pn 625-701) is for use with .175" primers.