WTP's Helix hub guards are designed to work on The Helixline of hubs, replacing the cones for a perfect fit without having to spread your dropouts. - Includes heat-treated chromoly adaptor to replace hub cone nuts for a perfect fit - Rear Hub guards are compatible with Helix V1 and Helix V2 freecoaster hubs and many other "KHE" style freecoasters on the market