Fulton Fas-Lok Trailer Coupler, made of zinc, has a 2 1/2" channel and is made to accept a 2" ball. This coupler is Class I through IV rated up to 3500 lbs. Features the Fas-Lok latching mechanisms which allow quick and easy trailer hook-up and is factory adjusted for end user convenience. This coupler also features and a lock hole for additional trailer security.