The park tool fr 52 cassette lockring tool heat treated alloy tool steel one inch base fits wrench or bench vise thin wall construction allows use without removal of cones and locknuts the fr 5 has 12 splines that are approximately 234mm across park tool fr 52 cassette lockring tool features 12 splines 235mm diameter fits shimanoreg sramreg including 1x sunracereg suntourreg chris kingreg and other cassette lockrings also fits some shimanoreg disc