The Lightweight Silicone-Coated Bike Lock, Model Number Ottolock, Lock (Blue). More Convenient U-LOCK - From the makers of OTTOLOCK, the SIDEKICK brings innovation to the traditional U-Lock with a compact, lightweight design that effectively deters opportunity theft without weighing you down. Simple to use and to carry, the portable SIDEKICK easily fits in many backpacks, bags, or pockets. Lightweight Bike Lock - At only 750 grams (1.65 lbs), the SIDEKICK allows you to lock a single tube to a post or pole at a fraction of the weight of a traditional U-Lock. The opening measures 2.75? x 5.75? (7cm x 14.5cm). Each lock comes with 3 keys Protect Your Frame - The body of the SIDEKICK is coated in high quality silicone that won?t scratch or damage your bike frame. Made with double-shackle 12mm hardened steel and an antirotation deadbolt for security and durability. Versatile Security - Use the SIDEKICK on its own or with a secondary lock depending on the length of your stop and location. Easy-To-Use - The SIDEKICK comes with three keys, and the compact size and bright color options make it great for kids and new riders who want to protect their bikes.