Material:High strength zinc alloy lock head, anti-rust and anti-corrosion, strong and sturdy. Seven-core protection, increasing safety factor. Lock body surrounded by PVC, comfortable and soft, avoiding scratching the frame, longer service life. Keyless lock:No key needed, just press lightly, the bike will be locked , convenient and fast. The outer layer of the key is wrapped with ABS plastic, which is strong and durable. Circular groove design, not easy to copy, increasing safety. Each key has its own number, low probability of unlocking by other same keys, safer and anti-theft. Multi-style bicycle lock ways:Bike lock has different styles of locking, complete. You can lock the rear fork or the rear wheel. It can also be used as a disc brake. You can use two or more locks to lengthen the bike lock and lock multiple bikes together. Portable and easy to carry: Single lock length is 15cm, diameter is 1.2 cm, circle diameter is 12.5cm, weight 177g, soft and comfortable, mini and portable. You can put it in your pocket or hang it on your arm or bike. Also, it can be hung under your bicycle saddle. Widely Application:Ideal for bicycle lock, mountain bike, road bike, city bike, mountain bike, perfect for your riding trips . provides various bicycle bag, anti-theft, meet your cycling needs.