Made of solid, heat-treated steel, the 1-inch base is compatible with wrenches and a bench vise. 12 splines, 23.4mm across. Thin wall construction allows use without removal of cones and locknuts. Compatible with Shimano®, SRAM®, SunRace®, SunTour®, Chris King® cassette lockrings. Compatible with SRAM® 11 and 12-speed cassettes. Also fits Shimano® disc brake lockrings.