Trimax Fixed Coupler Lock 3 1/2in 3-1/2inch. Comes in quantities of six. Features a coupler lock size of 3-1/2 inches. Trimax locks exclusive internal O-ring and watertight cap seal out moisture. Features of Trimax Fixed Coupler Lock 3 1/2in Trimax Locks exclusive internal O-ring and watertight cap seal out moisture The round key wont bend or break like flat keys and are impossible to pick Fixed coupler lock Precision construction Package Contents: Trimax Fixed Coupler Lock 3 1/2in Trimax TC3: Fixed Coupler Lock 3 1/2in 3-1/2inch