This Lang non-ratcheting serpentine belt wrench set is used to release tension on serpentine belt self-adjusting idler pulleys. This set includes:

• 3/8” drive bar for sockets and crowfoot wrenches
• 1/2” square drive bar
• 15mm, 16mm, 18mm 3/8” drive 12 point sockets
• 13mm, 14mm, 15mm 3/8” drive crowfoot wrenches