HitchMate 6013 Receiver Hitch Lock 2-1/2 Inch 2 1/2" Receiver Hitch lock 2 x 2 and 2-1/2" x 2-1/2" Use in place of standard pin and clip to prevent drawbar or accessory (Bike Rack /Ccargo Carrier) theft. Fits 2 x 2 (Class III and Class IV) 2-1/2" x 2-1/2" trailer hitches (Class V) Hitch requiring a 3 span