Kryptonite Security WheelNutzFitting to the solid axle hub to, securely, lock your wheel to your frame using gravity. Kryptonite have used gravity to their advantage to provide a safer locking system than ever. The WheelNutx also come with an inbuilt lock out system which means that they can only be removed by turning your bike upside down by 180-degrees.FeaturesWeather protective coatingCompatible with Messenger MiniProvide internal lock out functionQuick and easy to installUse gravity to provide a secure lockBuy Kryptonite Hubs from Chain Reaction Cycles, the World's Largest Online Bike Store.