WHAT'S HUB CINCH? HUB CINCH is composed of Cinch-Nut and Cinch-Cap.After replacing the original hub caps with Hubsmith Cinch-Caps, screw the Cinch-Nuts on Cinch-Caps and tighten the hex screw on the nuts to make the Cinch-Nuts tightly bite on the teeth of the Cinch-Caps in order to lock the axle in place tp prevent the nut from loosening. Simple-Fast-Secure! Hubsmith's patented HUB CINCH allows users to safely and securely mount and lock a wheel on any bicycle. No need for bulky general quick release!