【Double-opening Head】The bicycle u lock combination (some people call it D lock ) is a double-opening head, the thief needs to break u shape bike lock on both sides at the same time to open it, which is safer than a single-opening head u bar bike lock.【STURDY & DURABLE】The ebike or escooter U lock is made of environmentally friendly silicone cover and high quality alloy steel which is cutting-resistant, leveraging-resistant and dill-resistant. It will provide your bike with more safety. The silicone cover makes it resist from dust and dirt to prolong the life of your lock. At the same time, this bicycle lock will protect your bike from scratching.【ADDITIONAL 5.9FT CABLE】The U-lock combin with 5.9FT steel loop cable can provide your bike with greater locking flexibility and better protection. With 5.9ft high-quality steel cable allows greater locking flexibility. Secure your bicycle, motocycle, electromobile to bike racks, fences, poles and more.【Portable Size】The size of the u lock for bicycle is 7.9 in * 5.1 in, which is the same size of a 9.7in tablet and is convenient to carry. In addition, come with a mounting bracket that is suitable for all-round tripods with a diameter ≤ of 1.18in (30mm).【Imported Lock Cylingder】The lock cylinder of the bicycle is made of C-grade pure copper blades and has a precise structure to prevent various technologies from opening. In addition, the bike u locks heavy-duty anti-theft is equipped with two rust-proof copper keys with a complex snake-shaped slot, which is safer to use.