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 Class Stainless Steel Key - 3 high class stainless steel keysdistinguished key mouth design to avoid mix opening. Also there are serial numbers, if lost, key remake is available. High Security - Bicycles are mostly quick-release seats,there are security risks, can easily take away. Wheel and seat distance of 23cm or less, can lock the wheel and seat. after folding, the bike lock size 5cm * 7cm, compact, lightweight and convenient to store in top tube bag, saddle bag, etc. Easy Carry, Compact, and Flexible - The Folding lock fits most bikes, it only weights 575g easy to carry featuring special rivets that make folding easy.