1. Zinc Alloy Lock Cylinder & Tough Steel Cable: This bicycle lock adopts high-quality lock cylinder with high stability. Strong inner alloy core protection makes your bike r and anti-theft better. The sturdy steel cable is made of tough steel wire, which is anti-prying, anti-smashing and not easy to cut. High hardness alloy lock, anti-smashing, anti-corrosion, not easy to break. 2. Easy to Lock: No key is required to lock, after locking, the buckle can leave. It is very suitable for people who are in a hurry in the morning, and the operation is simple. This is a simple locking mechanism that can be locked by inserting a locking bolt, which is quick and easy. 3. 12mm Diameter : The 12mm diameter prevents strong cuts. The high quality PVC coating is made of non-toxic PVC, which helps prevent the lock from scratching your bike, grill, golf cart, luggage, and protects it from wind, rain, sun and rust, Avoid the intrusion of water spots. 4. Keyless, Easy to carry: Four-digit password, made of alloy steel, no need to worry about the lock cylinder being opened. With high security settings, the probability of trying to open the lock is almost zero. Safe and anti-theft, easy to use. This is a resettable combination lock, you can reset the combination at any time. Only 2 feet long and 148 grams, it is more convenient to use and carry.