Collet for changing counterpressure springs, makes it easier to screw the central clutch nut. 2nd image shows how simple it is to use. Ideal for working alone. 2 different sizes: up to 125mm for almost all 50cc scooters, and up to 220mm for maxi scooters and quads. Universal locking tool. Locks the convertor unit and allows the central nut to be removed or locked.