Sturdy and Durable - Made of quality zinc alloy and ABS materials, this lock offers high resistance to theft, impact, and cutting. The lock body combines zinc alloy and ABS for enhanced durability, providing anti-theft, anti-cut, and tamper-resistant performance. Theft-Proof and Waterproof Design - The lock core is coated with rubber lacquer, offering protection against impacts and reducing noise during transportation. This helps prevent damage to the bicycle frame and allows direct attachment to the frame, securing the folding lock in place and protecting it from unauthorized access. High-Quality Stainless Steel Keys - Includes 3 stainless steel keys with a distinct keyway design to prevent incorrect insertion. Each key features a serial number for easy replacement if lost. High Security - Designed to secure bikes with quick-release seats, which are vulnerable to theft. With a 23cm or shorter wheel-to-seat distance, it effectively locks both the wheel and seat. When folded, the lock measures 5cm x 7cm, making it compact, lightweight, and easy to store in a top tube bag, saddle bag, or similar compartment. Easy to Carry, Compact, and Flexible - This folding lock is compatible with most bicycles, weighs only 575g, and features reinforced rivets for smooth folding and portability.