1、Applicable Model: This clutch spring compressor is universal for motorcycles and scooters, suitable for 50 to 250cc engines with 125‑155mm pulley. 2、Main Function: Designed to assemble or disassemble a backpressure spring. With this collet, the backpressure spring will not jump in an uncontrolled way. 3、Easy Use: Just place the converter unit, including the clutch, between the assembly tools, the assembly tool screws can now be tightened, and once firmly in place, all you have to do is loosen the nut on the coupling. 4、Durable Material: The clutch spring compression tool is constructed of durable carbon steel with an antirust coating on the machined surface to ensure long term performance. 5、Rigorous Testing: Manufactured according to strict production specifications, it is recommended to use it with clutch nut wrench to safely disassemble and assemble the scooter clutch center spring!