Lisle 57600 Serpentine Belt Tool. The Serpentine Belt Tool releases tension on serpentine belts with a spring loaded idler pulley. This tool is used to remove and install belts on serpentine belt systems using the spring loaded idler pulley. Fits idler pulleys requiring 13mm, 15mm, 16mm, 18mm hex and 3/8" square drive sizes which covers almost all domestic applications.
