This helmet lock features a high-precision code wheel and mechanical structure design for high security. Made from alloy and plastic, it has a rubber steel rope that is not easy to wear. The lock has a 3 dial combination design and can be easily carried. It is suitable for bundling helmets and has a universal size of about 70*50mm/2.76*1.97in. The total length of the wire is about 75cm/29.53in.