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SB316XL 4" square tube, 16" offset. Extra long coupler tube for flatbed trucks with recessed ball. The XL part of the part number is what makes this sutible for flatbed trucks with recessed ball cavity. The XL adds 4" of additional height below the offset plate, this allows it to ride high enough to clear the bed floor when turning. Rated at 24,000 lbs GWR and a vertical load of 5,000 lbs.