Safer: The lock cylinder of the U-lock is made by a C-grade pure copper blade, which has a precise structure to prevent technical opening. In addition, this bike lock comes with 3 rust-proof pure copper keys that have a complex serpentine slot, it will be safer and you never have to worry when you lose one. Sturdy and Durable: The heavy-duty bike U-lock is made from a high-performance hardened steel shackle that resists cuts and prying attacks. It will provide your bike with more security. The silicone cover makes it resistant to dust and dirt to extend the life of your lock, this U-lock will protect your bike from scratches. Portable and Save Space: The mounting bracket on the bike can fix the U-lock and take it with you at any time. The high-quality, convenient mounting bracket means your lock goes with you, no additional packaging required. Never worry about leaving home without your lock again. Design and Performance: The coated silica gel layer protects the bike lock to prevent scratches. Waterproof bike lock with mounting bracket, The mounting bracket holder is easy to install, you can refer to our instructions to install it. This easy and convenient installation allows you to take and store your lock quickly when going out Package List: 1 x Bike U Lock 1 x Cable 1 x Mounting Bracket 3 x Keys