Double Open Design-Combination Lock or Key Lock: 4-digit combination locking mechanisms for high- bicycle lock can be reset for a 10,000 set password combination for our bike chain lock and the original password is '0000'Moreover, you can use the key to lock and turn on, when you forget the password Better bicycle lock and long enough chain: This bicycle chain lock is up to about 179 mm in diameter, which is strong enough to provide performance against theftIn addition, the bicycle lock is 3 FT (96 cm) length, you can lock two or more bikes at the same time, which is more suitable BIG QUALITY: This bicycle lock is made of high strength durable metal materialThe zinc alloy lock cylinder is covered with hardened steel material and strong and robust ABS plasticThe heavy type material lock makes it abrasion resistant, stainless and interrupted resistant and non -slip fabric cover: A high -quality polyester protective case is used to make chain lock more smoother, durable and abrasion resistantIt does not scratch the body, maintains the perfect appearance of your bike and does not sound during driving Large Application: The length of the bicycle chain is 3 fit/96 cm and its weight is 03 lb/420 gRockbros bike locks motorcycles, bicycles, e-bikes, doors, fences and even lawn mower, stairs, sports equipment and so onperfect forNote: Please do not leave your bike out for a long timeEspecially in regions with high crime rateNo bike lock is 100 %!