One hitch lock and one coupler lock KEYED ALIKE for your convenience. Now you can lock your hitch and trailer with ONE key. Hitch Lock Fits 2" x 2" trailer hitches (Class III and Class IV), Pin diameter: 0.625", Inside width: 2.625", Overall Length: 6", Coupler Lock, Fits lever style trailer couplers requiring a 0.50" span, Pin Diameter: 0.25", Inside Width: 0.50", Overall Length: 4.125".