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. Fits ShimanoÆ, SRAMÆ, SunRaceÆ, SunTourÆ, Chris KingÆ and other cassette lockrings. The FR-5 has 12 splines that are approximately 23.4mm across Also fits Shimano disc brake lockrings. Always use a quick release skewer to hold the tool in place and snug to cogs when loosening. For solid axles, use the axle nut.