Used to service automotive serpentine belts equipped with spring loaded tensioners, without having to remove other components. Multiple size adapters allow service to most automotive serpentine belt applications. Fine ratcheting action and low profile enables work in restricted areas. 7/8" wrench configuration allows for quick and easy change of adapters. Heat treated and chrome plated for strength, durability, and appearance Set includes: 6 point 3/8" square drive 13mm (1/2"); 1/2" square drive 14mm (9/16"), 15mm, 16mm (5/8"), 18mm, 19mm (3/4").