Converts a gooseneck style trailer to kingpin for use with a fifth wheel hitch. Simply remove the trailer's gooseneck coupler, slide in the kingpin adapter and adjust the height. Constructed of 4" round, 1/4" wall tubing, 22" long with 8" diameter bolster plate. Rated 30,000 maximum gross trailer weight. Pipe may be drilled to adapter in place pin. Do not drill through seams in pipe. Made In U.S.A.