The FAIRMOUNT® Serpentine Belt Tool Set is an integral tool when removing and installing serpentine belts with spring-loaded, idler pulleys. The 23-Inch long slender design provides proper reach and prevents damage. Serpentine Belt Tool removes tension on spring-loaded idler Eases Removal and installation of serpentine belts Extension bar for hard to access areas 3/8\" Drive chrome vanadium sockets in 13,15, 16 and 18mm It also includes 9-Inch extension tool for longer reach applications and multiple angle work.