It's always good to carry a cable lock just in case you can't see your bike from inside the coffeeshop. But, cables can get unruly and take up quite a bit of space in your jersey pocket. The Serfas KL Puck lock solves this conundrum with a simple folding lock that fits neatly into just about any pocket. This self-contained unit was fashioned with a 3mm hardened steel plate. Wrapped around this plate is a series of links connected with stainless steel rivets. The total length of the unwound links is 25 inches, enough to secure your bike to a rack. And, because it is designed with links, rather than cable, it's not easy to cut. Serfas' KL Puck Steel Plated Key Lock comes with 2 keys and a mounting bracket. It is available in One size and One color.