Numeric code: Factory set to 00000. Follow the instructions to change the desired combination. The 5-digit password provides up to 100,000 possible combinations and is more secure. And the combination is individually adjustable and can be changed as many times as needed. Sufficient length: Thanks to its flexibility and length of 90 cm/100 cm, the chain offers Heilwiy a high degree of comfort and multiple possibilities for connecting the bike to a fixed object. The longer the length, the easier it is to connect to a solid object. Good security: The bicycle lock uses a high-strength zinc alloy lock core, which is smooth, rust-proof and durable. Therefore, it protects your valuables from theft. Extra protection: The chain lock with Heilwiy soft fabric cover prevents scratches on your bike, and the full chain is electroplated to be rust-proof and waterproof. Versatile: Perfect for Heilwiy to protect bicycles, motorcycles, skateboards, sports equipment, gates, fences, ladders, tool boxes and more. Can be easily wrapped around the bicycle frame when in use.