Knipex 4421J11 Internal Angled Retaining Ring Pliers 5.2-Inch For easy fitting of internal snap rings. For rings 12 - 25 mm in diameter. Tips are forged inward to prevent retaining rings from slipping off and are used for installing & removing internal rings on the inside bore holes. Forged from chrome vanadium electric steel and designed to minimize tip breakage, and offer extended tool life. Plastic coated handles.