This tool is used to remove and install belts on serpentine belt systems using spring-loaded idler pulleys. Select appropriate socket size and locating tool idler arm, (handle is for 16mm applications only.) Pull or pull to release tension. Application: 3/8inch drive rod for socket and claw wrenches:for 1.9 and 2.3L; Universal 3.1L 1/2inch Square Drive Rods: for 2.5 and 3.0L for 4.6L. 3/8inch drive 6 point 15mm .: for 3.0 and 3.8L; for 3.0, 3.3 and 3.8L; Universal 2.2, 2.8, 3.8 and 4.0L. 3/8inch drive 6 point 16mm .: for 3.8 and 4.0L. 3/8inch drive 6 points 18mm .: for 3800. 3/8inch Drive 13mm Claw Wrench : Universal Four Engine 3/8inch drive 14mm claw wrench: Engine 3/8inch drive 15mm claw wrench: for Windstar with 3.8L engine Colour:Black-Red Material:Metal Package Contents: 1 set * idler pulley adjustment wrenches Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.