●【High Quality Material】Bicycle locks are made of coarse high strength alloy, which is very sturdy and designed specifically to prevent theft. The lock head is made of high strength, durable, waterproof ABS material, adopting precision zinc alloy lock core, which improves safety and durability ●Dustproof Shutter Design: The lock hole on the key lock is equipped with a dust-proof cap to prevent the entry of dust and sand and other foreign objects, and considerably reduce the infiltration of rain water, and greatly improve the life of the lock core ●【Easy to Open and Close】The copper keys are very durable on both sides and sides. When locking, simply insert the tip into the lock hole. To unlock, simply insert the lock!! Easy to operate, no need to worry about trouble, very friendly for all users ●Wide range of uses: Chain lock length 37.4 to 1.2 inches (95 to 3 cm), can be used in a wide variety of other daily life theft prevention needs such as motorcycles, bicycles, office doors, etc ●【Quality assurance】Our bicycle locks are 100% inspected and tested to ensure reliable product quality. We also provide 24 months quality assurance. If you have any problems after the purchase please contact us (email: jp15014102255@126.com)