Converts any multi-speed Campy-splined cassette hub to a single speed. 10mm wide steel cog spline spreads load over greater surface area, preventing cog from deforming alloy freehub spline. Kit offers a degree of chainline adjustment by switching spacer position. Includes a drilled 18 tooth CrMo steel 5/64" cog, two drilled, splined alloy spacers and a Campy lockring. 92g.