The RCBS 3-Way Cutter is designed for use on Trim Pro Case Trimmers and reduces the trimming /deburring chore. The 3-Way Cutter not only trims cases to lengths but an inside blade chamfers the case while an outside blade deburrs it. Install on all Trim Pro Case Trimmers. Order one 3-Way Cutter by caliber and then simply order additional chamfer/pilots for other calibers. Mfg: Rcbs