Removes and Installs Belts on Serpentine Belt Systems Using the Spring Loaded Idler Pulley. Ratcheting head with freewheel position allows maximum leverage. Set ratcheting head to the middle or neutral freewheel position and once maximum travel point is reached simply click lever into place to lock the ratchet mechanism. Comes with extension for hard-to-reach idler pulleys. This tool will work where conventional ratchets or breaker bars won't fit due to limited access.