Fits cassette lockrings from most brands including Shimano, SRAM (including 1x), SunRace, SunTour, and Chris King, as well as Shimano disc brake lockrings Fits 12-spline 23.4mm diameter tool fittings Features 5mm guide pin to stabilize tool when used with quick-release hubs One inch hexagonal base fits wrench, socket or bench vise Heat treated alloy tool steel Park Tool offers a full range of tools for bicycle cassette lockring removal and installation. The FR-5G fits 12 spline 23.4mm diameter tool fittings - the most common tool fitting found on 7-12 speed bicycle cassette lockrings, including many Shimano, SRAM, SunRace, SunTour, Chris King and others. Also fits Shimano disc brake lock rings with 12 internal splines. Thin wall construction allows use without removal of cones and locknuts. Features a 5mm guide pin to stabilize the tool when used with quick-release hubs. The 1" hexagonal base can be used in conjunction with a socket, wrench, or bench vise. Heat treated alloy tool steel construction for a lifetime of use. The FR-5.2G has 12 splines that are approximately 23.4mm across.