1.The bike U-lock is equipped with 3 copper keys, including a mounting bracket. The surface of this U lock is made of PVC and ABS engineering plastics, and the bike chain cable is made of aluminum material which provides strength and flexibility for you 2. We designed a small cover for the anti-cutting U-lock hole to prevent dust and rain from entering the keyhole. The braided steel for superior strength and flexibility meets the requirements of use 3. Don't let your bike have many thieves there, and regularly check your bike. 4.Ideal for bikes, electric bicycles, scooters, folding bicycles, mountain bikes, skateboards, sports equipment, iron doors and fences, barbecue grills and lawnmowers, tools, motorcycles, boats, mechanical equipment, glass doors, toolboxes, etc 5. The U-shaped lock is easy to install with a screwdriver and can be used in conjunction with a wire rope lock to increase the range and scene of parking bicycles