Features and Benefits:Used to release tension on serpentine belt self-adjusting idler pulley;Push or pull to release tension;Crowfoot wrenches provide maximum coverage and access;Long bar is 3/8" drive, short bar is 1/2" drive;Changing a serpentine belt without the proper tool can be frustrating and time consuming. Save yourself time and effort with a tensioner tool kit, and rely on the quality workmanship and innovative design of GEARWRENCH to handle any vehicle�s unique access challenges. Use the wide range of attachments on the ratcheting wrench to easily reach and maneuver tensioners in almost any application.