Popular shackle length with improved user settable steel ball click-combo lock system. Shackle Dimensions: 115mm x 230mm (W x H x Diam) (4.53″ x 9.06″) x 13mm (0.51″) D. The best-selling Bulldog combo series u-locks offer the same level of security as Bulldog keyed locks, but with the convenience of not having to carry a key.