Trimax Universal Trailer Lock Keyed Alike. (From 1-7/8 inch 2 inch to 2-5/16 inch ALL Coupler Types) UMAX100 - TRIMAX-Premium UNIVERSAL 'Die-Cast' Dual Purpose Coupler Lock (Fits ALL Couplers). Built with precision for optimal performance and reliability. Features of Trimax UMAX100-KA Universal Trailer Lock Keyed Alike One size fits all Keyed alike From 1-7/8 inch 2 inch to 2-5/16 inch ALL Coupler Types Fits all couplers Package Contents: Trimax UMAX100-KA Universal Trailer Lock Keyed Alike Trimax UMAX100-KA: Universal Trailer Lock Keyed Alike