FORGEMECH 12" Trailer Hitch 2" Square Class III Extension Adapter Towing Extender #5000 lbs 12" Long Hitch Box Extender for 2" receivers. Gross Tongue weight is restricted to 500lbs maximum (per manufacturer) Center line of pin hone to pin hole is 12" Extension overall length is 17.0" Material: 2" and 2-3/8" steel square tube, wall thickness 0.235"