The magnetic Lisle Corp. Pinion Shaft Seal Installer, No. 56950, is ideal for driving pinion and other seals into place. The hollow adapter allows the driver to slide over shaft to drive seal. Neodymium magnets on both driver faces hold the seal in place until users are ready. Adapter is double-sided for different sized seals. Works on many applications, especially Ford SUV pinion seals. Can also be used on standard seals. Made from lightweight aluminum to allow more driving power to transfer. Metal cap is replaceable.