Check the listing for details. Serpentine Belt Tool Set 3/8"Pulley Wrench Installation Removal Tool. Condition: New, Made in China. Listed at 26.59 USD. Description: 8pcs Serpentine Belt Tension Setting Wrench Tool is designed to aid in the removal and installation of serpentine belts on engines that have spring-loaded idler pulleys. Its thin design and flexible extension allow it to get into areas ratchets and breaker bars cannot,and provides the required leverage and clearance to release the spring pressure and remove the tensioner pulley. Serpentine Belt Tool is formed of carbon steel and features a black oxide finish for additional durability and to resist rust. The tools include three separate sockets (15mm, 16mm, and 18mm),three separate crowfoot wrenches (13mm, 14mm, and 15mm),a 3/8 inch square drives handle of 59cm length and a 1/2 inch square drives adapter of 23cm length, it will work on most cars. .