Aluminum spacers to convert a Shimano splined cassette hub to a single speed . Also available with cog and chain-sandwiching guide plates for added chain security. Features: Fits Shimano freehub bodies except deep spline 10-speed Singlespeed conversion kit with chain guide for Shimano freehub bodies Six spacers, two chainguides, two 1mm shims, 16-tooth cog, lockring