As the name may imply, the Kryptonite Gravity WheelNutz is a gravity locking system that secures to your front wheel to prevent the theft of your favorite ride. WheelNutz feature an internal Lock-Out function that can only be removed by turning the bike upside down 180 degrees, while the Weather Guard coating helps prevent corroding when out in the elements. Plus, since it only requires a 15mm wrench, this device is installed quickly and easily in seconds.