Portable & Rugged: The Sportneer bike U-lock is both portable and heavy-duty. It measures 7.87 x 6.3 inches, with a thickness of 0.71inch/18mm, and weights 3.1lbs. Plus, its silicone coating(0.1inch) resist water, dust, and dirt, keeping your bike scratch-free and in tip-top shape. Boosted Security & Anti-Theft: Thanks to the zinc alloy lock core and alloy steel lock head, this U-lock can withstand hydraulic shear forces up to 12 tons. It’s tough as nails, resisting cutting, sawing, smashing, and drilling to protect your bike from potential theft. Convenience and Security: Our Sportneer bike lock comes with three keys. You can carry one with you and keep the others at home or in the office to prevent accidental loss of the spare key. Wide range of uses: This bike lock can be used to lock bicycles, children's bicycles, electric bicycles, ladders, barbecue grills, sports equipment, lawn mowers, gates, etc. The bracket fits bike tubes with a diameter under 2.2cm/0.87inch-8cm/3.15inch, allowing you to lick your bike with ease. (Be sure to confirm the corresponding size before purchasing to ensure it can be used). Great gift: This bike locks is very suitable for family, friends or cycling enthusiasts. Especially for those who need to park their cars in public places, this lock will be a very thoughtful and reassuring gift. Sportneer Bike U Lock: 18mm Shackle Heavy Duty Bike Lock with 6ft Security Steel Cable - Bicycle U-Locks with Keys and Sturdy Mounting Bracket for Road Mountain Bike Bicycle