[HIGH SECURITY & RESETTABLE]: 5-digit resettable combination bike chain lock has the number of 100000 possible combinations (original password is 00000) much safer than other 4 digit locks. You don't need to bring a key, just remember the code you reset.[STURDY & DURABLE]: The high security bicycle lock is made of zinc alloy which is drill-resistant and anti-tech unlocking.[NYLON COVER PROTECTION]: The bicycle chain lock made of nylon cloth cover, scratch-proof and wear-resistant, anti-hot and anti-icing hands; it protects the chain and prevents it scratching your bicycle frame, long lifespan.[MULTI-PURPOSE]: It's 900mm long and 730G, chain 7mm diameter, the length and flexibility of the chain lock can secure your bike to a variety of objects. It can be used for motorcycles, E-bikes, skateboards, grills, scooters, doors, lawnmowers and many others.[KIND TIPS]: While locking up, please make sure the cycling lock goes through both bike frame and wheel, then locked to an strong, immovable object. And please do not forget your own code. It is best to take a picture of the set password to prevent forgetting.