KDT3414 Features: - Provides the required leverage and clearance to release spring pressure and move the tensioner pulley. -Services a variety of vehicles equipped with this style of accessory drive belt. -Replacement parts are availableThis tool is used to release tension on the serpentine belt self-adjusting idler pulley. It's simple to use, just push or pull to release tension. This tool has been tested in the "field" with professional users and the quality is superb!. -Serpentine Belt Tool. Generic Dimensions: -Handle has a 3/8" drive for other jobs requiring extra leverage. Dimensions: Overall Height - Top to Bottom: -1.9 Inches. Overall Width - Side to Side: -4.5 Inches. Overall Depth - Front to Back: -24 Inches. Overall Product Weight: -3.05 Pounds.