OnGuard's K-9 combines U-lock strength with the versatility and ease-of-use of a cable lock. It's constructed from hardened steel plates and features OnGuards pick, pull, and drill-proof lock cylinder. Once unfolded, the K-9 has plenty of length to secure frames and wheels to a rack or other solid object. It includes a push-button release mounting bracket that attaches to water bottle bosses or straps to any part of your bike frame. For added versatility, a water bottle cage can be mounted on top of the bracket so you'll have room for security and hydration.