Secure & Resettable This bicycle chain lock uses a five-digit combination resettable lock mechanism, which can set more than 10,000 code combinations, which is more difficult to crack and more secure than a four-digit combination lock. Keyless design to avoid the hassle of forgetting or losing your keys.Strong & DurableThis bike chain lock has a lock cylinder and digital adjustment knob that is made of zinc alloy, the chain of the chain lock is made of 0.24 inch alloy steel with drill resistance, corrosion resistance, wear resistance and Anti-technology unlocking, it is a heavy-duty anti-theft lock that provides maximum safety for your bike in all risk areas!Thickened Textile Cloth Protection This bicycle chain lock is wrapped in high-quality polypropylene textile cloth, the textile density of the fabric is tighter, the thickness is thicker, the fabric is scratch-resistant, wear-resistant, heat-proof and anti-icing hands, it can not only protect the chain from rust, so that it can extend its life but also prevent it from scratching the bicycle frame.Easy to Use & Versatile: This digital code chain lock has a default code of 00000, you can easily set your own digital code according to the pictures or video steps we provide, the code is resettable. The length of the chain is 3.2/3.9 feet, it can lock 2-3 bicycles at the same time, if you want to lock something thicker, you can also link multiple chain locks together, the lock can also be used for motorcycles, scooters, skateboards, grills, ladders, doors, lawn mowers, etc.Cost-effective: We pay great attention to the quality of chain locks, there are many locks of the same style on the market, some chain locks are the same length and thickness as ours but the weight is much lighter than ours, you need to know that the weight of good alloy steel is heavier, zinc alloy lock cylinder is also heavier than plastic lock cylinder, please pay attention to the comparison before placing an order, please contact us if you have any questions.