Widely applicable, easy to disassemble, and . This tool is used to remove and install belts on a serpentine belt system using a spring-loaded idler. Choose the appropriate sleeve size and positioning tool idler arm (handle only suitable for 16mm applications) to pull or pull to release tension. The locking nuts and component mounting bolts on the tensioning, timing, or auxiliary pulleys may be difficult to access. Usually hidden in the engine compartment, behind the components, usually near the radiator or other obstacles. This pulley wrench set has a long curved handle for easy operation and is equipped with 13 interchangeable adapters, suitable for almost all types of vehicles. Scope of use:Idler belt screws are used for installation, disassembly, and in narrow spaces inside the engine compartment. The screws are usually hidden behind the accessories in the engine compartment and are equipped with an arc-shaped wrench that can bypass obstacles to tighten the screws. Model Number:Idler pulley adjusting wrench E-type specifications (5 pieces): E10/E12/E14/E16/E18 sockets (8 pieces): 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm note:Plastic box color is random, no specified color is accepted Colour:Silver Material:Metal Package Contents: 1 set x (15pcs)idler 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.