Sturdy and Durable - Quality lock made of zinc alloy and ABS, sturdy and durable with high-quality anti-theft, anti-breakage, and anti-cutting functions. The material of the hamburger lock is made of zinc alloy and special ABS material, which has the function of anti-theft, anti-cutting, and tamper-proof. Anti-theft and Waterproof Design - The surface of the lock core is fully sprayed with rubber lacquer, and the shock-proof bumper during transportation reduces noise, effectively preventing damage to the bicycle frame, and can be directly locked on the lock frame, protecting the folding lock and preventing the lock from being locked. < p> High Quality Stainless Steel Key - 3 high quality stainless steel keys, distinguished key mouth design to prevent mixing opening. There are also serial numbers, in case of loss, a key remake is available. High Security - Bicycles are mostly quick release seats, there are security risks, can easily be taken away. The distance between the wheel and the