·【 High Quality U Lock】:ROCKBRO bike U lock is made of 0.84inch (21.4mm)alloy steel( including 0.36inch silicone cover). The Lock features zinc alloy C grade lock cylinder, Which is leveraging-resistant, cutting-resistant, and drill-resistant. Also, the lock is able to resist 12 tons of cutting force. Even a smart thief , cannot do anything about it

·【 Loop Cable &Versatile Use】:Comes with a 3.94 ft double looped ends steel cable, which has t PVC shell. The whole diameter of the cable is 0.39inch. There are 3 rust-resistant copper keys that have complex serpentine slots, keys are not easy to be coppied. This lock is strong to keep your bike ,sccoter or motorcycle safe

·【Fully Protection】: This bike lock features a hardened steel body and double locking shackle for superior cutting and prying resistance. The lock crossbeam has passed multiple quenching heat treatment processes to improve the hardness and strength, effectively resist any violent damage

·【 Portable Size】:The size of the bike lock is 7.87 *6.3inch. Comes with a mounting bracket that is suitable for all circular seat post in diameter ≤1.38 inch(35mm). With the portable size, you can put the bike u lock into your bag or mount it on the seat post of your bike

·【 Easy to Install】: Convenient mounting bracket ensures safe and compact storage when cycling, the lock does’t need to pack your lock in a separate carry case or knapsack. The silicone cover of u lock will protect your bike from scratches and it will prolong the life of this u lock