Features： 1、Protect your bike from various methods of thief effectively. 2、Good resistant to cutting,breaking,sawing and shearing. 3、Made of hard alloy steel,it is not easy to be cut and leverage attacks. 4、Silicone outer cover prevents corrosion of water,dust and dirt. 5、Mounting bracket can be easily fixed on the bike tube(Max.29mm/1.1in) when you do not need. 6、Comes with 3 keys,you will never have to worry when you lose one. 7、Suitable for for mountain bikes,electric bikes,motorcycle etc. Specification： The Bike U Lock is suitable for bicycle,motorcycle and electric mobile etc. Features: Protect your bike from various methods of thief effectively. Good resistant to cutting,breaking,sawing and shearing. Made of hard alloy steel,it is not easy to be cut and leverage attacks. Silicone outer cover prevents corrosion of water,dust and dirt. Mounting bracket can be easily fixed on the bike tube(Max.29mm/1.1in) when you do not need. Comes with 3 keys,you will never have to worry when you lose one. Suitable for for mountain bikes,electric bikes,motorcycle etc. Specification: Model: Lock Set / Lock&Cable Set (optional) Total weight: Approx. 790 - 1080 g / 1.7 - 2.4 lb Package size: 210 * 130 * 50 mm / 215 * 135 * 60 mm Package weight: Approx. 867 - 1182 g / 1.9 - 2.6 lb Lock: Material: Alloy steel + Zinc alloy + Plastic + Silicone Size: 193 * 123 * 32 mm / 7.6 * 4.8 * 1.3 in Alloy steel diameter: 16 - 18 mm / 0.6 - 0.7 in Weight: Approx. 716 g / 1.6 lb (not include the keys) Mounting bracket: Suitable for tubes up to 29mm/1.1in in diameter NOTE: Please allow slight measuring deviation due to manual measurement. Package List: 1* Lock 1* Mounting Bracket 3* Keys Package List： 1* Lock 1* Mounting Bracket 3* Keys