General description The Heavy Duty U-Lock features a 4-digit rotary combination password lock with a U shackle, providing a perfect blend of security and convenience. It allows for two ways to unlock: using a combination code or a mechanical key, eliminating the hassle of carrying keys while ensuring your bike remains secure. This U-shaped lock is ideal for bicycles, motorcycles, and electric bicycles, offering high anti-theft performance with over 20,000 possible combinations. Technical specifications Type: U-Lock Combination: 4-digit rotary Number of combinations: Over 20,000 Usage Suitable for bicycles, motorcycles, and electric bicycles Can also be used as a lock for glass doors and electric scooters Rust-proof and weather-proof for outdoor use Other information Durable and wear-resistant lock beam Lock beam undergoes multiple heat treatments for enhanced hardness and strength Effectively resists external destructive forces