Cappuccino(R) Lock is an innovative way to lock your bike with just a helmet strap. The locking method is very easy. Simply insert the male side of the Razor "Z" helmet buckle into the Cappuccino(R) lock, insert the locking pin into the female side and turn the 3-digit dial. For laser "Z" buckle only. With a hole for phone strap. L 1.1 x W 3.4 x H 0.7 inches (29 x 823g Visit www.cappuccinolock.com and By registering the unlock number, you can even forget the number. You can check by entering the information you need.