This case prep tool is deigned to work in both of Forster "Original" and "Classic" case trimmers for faster, more accurate results than prepping by hand to ensure that each case is in the best condition for reloading. Pocket Cleaner removes brass shavings after using the chamfer tool and gets out stubborn powder residue that can interfere with correct primer seating depth. Sizes available for large (.210") and small (.175") primer pockets. Mfg: Forster Products, Inc.