The Lisle Corporation Serpentine Belt Tool Kit, No. 59670, releases tension on serpentine belts with a spring loaded idler pulley. The kit is used to remove and install belts on serpentine belt systems using the spring loaded idler pulley. For applications with limited access, 13mm and 16mm sockets are built into the handle. The kit covers most domestic and some import applications. It comes with an extension for hard-to-reach idler pulleys, along with nine low profile sockets to fit into tight spots.