Lisle's stretch belt installer/remover, No. 59370, allows the technician to easily slip off the old stretch belt and slip on the new one without having the tool fall to the shop floor when turning the pulley. This is done by having a powerful internal magnet inside the tool that keeps it securely on the pulley, even when upside down. Can be used on both the front and back side of the pulley. Helps prevent damage to belt and/or pulley during removal and installation.