Specialized DT Swiss Ring Nut Tool Description: The Specialized DT Swiss Ring Nut Tool aids in the removal or installation of threaded ring nuts found within DT Swiss rear hubs equipped on select Specialized bikes. Features: Genuine Specialized service parts DT Swiss hub service tool for select Roval wheels Compatible with all DT Swiss star ratchet hubs including 180, 240, and 350 Hardened steel construction guarantees years of use