Krypton Evolution Disc U-Lock The compact Evolution is designed with a smaller opening, preventing the use of jacks and other prying tools. 1/2" Hardened steel construction. Features Includes bracket and lighted key Short crossbar and shackle create the closest, most compact fit - that means better security | Kryptonite | Evolution Disc U Lock 1. 7 " X 1. 9", Bracket Included