Sturdy and Durable: Quality Zinc Alloy and ABS made lock, sturdy and durable with high grade of anti-theft, anti-breaking and anti-cutting function. The hamburger lock material are zinc alloy and ABS special material, which have the function of Anti-theft, anti-cut, tamper-proof. Theft-Proof and Waterproof Design: The lock core surface is fully sprayed with rubber lacquer, and the anti-impact 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.High Quality Stainless Steel Keys: 3 high class stainless steel keys，distinguished key mouth design to avoid mix opening. High Security: Bicycles ar.