The Lang serpentine belt wrench releases the tension on spring-loaded idler pulleys. The Lang serpentine belt wrench allows direct access to the tensioner without having to remove engine accessories or frame components. This can be done by rotating the drive end on the wrench to match the position of the serpentine belt tensioner.

The ratcheting feature of the Lang serpentine belt wrench allows quick and easy positioning to access the tensioner from any angle. The Lang serpentine belt wrench features a slim head design for access to restricted areas, is heat-treated and nickel-chrome plated for strength, durability, appearance and long tool life.