The OnGuard Bulldog MINI 8013 U-lock is a sturdy and reliable lock designed specifically for track bikes and fixed gear bikes. Made from 13mm MAX-Performance steel, this U-lock provides a high level of security for your bike. With a compact size of 3.55" x 5.52" (9cm x 14cm) and a weight of 1.5 lbs, it is easy to carry around and store in your pocket. The lock comes with 5 keys, one with a light for added convenience. Additionally, the frame bracket included makes it easy to attach the U-lock to your bike for added safety while riding.