1. Made from high quality hardened carbon steel, this lock provides superior resistance to cutting, sawing and prying. Its robust design ensures excellent security and effective theft protection. With a complex zinc alloy lock core paired with a snake slot copper key, it is designed to be difficult to open when locked, which further improves its anti-theft ability and protects your property. 2. Waterproof and dustproof: The bicycle shackle lock is wrapped with a durable protective material, which provides effective waterproof, dustproof and scratch resistant properties. This design prevents rainwater from entering and protects the lock core from rust. In addition, the protective layer helps maintain the integrity of the lock during use, extends its service life while protecting your bike from scratches. 3. Heavy duty construction: This U-lock is made of hardened high performance steel, making it highly resistant to cut and lever attacks. 4. Advanced locking mechanism: The mountain bike lock features a zinc alloy lock core with an ingenious serpentine wedge groove that effectively deters keyless release attempts and provides an extra layer of security. 5. Use scenarios: - Securing a bicycle to a rack or post in urban areas, campuses or public spaces during work, study or errands. - Safely locking a bike while traveling or staying in hotels, hostels or airports where extended unattended periods occur. - Storing a bicycle in a garage, courtyard or outdoor area where weather exposure and potential tampering require reliable protection.