BikeMaster Piston Ring Compressor SetPacked in a heavy duty carrying case, the kit comes with locking band pliers with textured non slip grip and six bands for pistons ranging from 2 7 8 to 4 3 8 in., 73 to 111mm. The locking band pliers, which feature a fine locking ratchet allowing precise adjustments of thering bands. The rings fit a wide range of motorcycles, from dirt bikesto big V Twins, from 2 7 8 to 4 3 8 in., 73 to 111mm cylinder bores,all in one kit. Piston ring bands are