This receiver hitch adapter is designed to fit a 2-Perfect Steerable Transfer Carth x 2-Perfect Steerable Transfer Carth receiver tube opening. It not only extends the receiver but also provides 4 Perfect Steerable Transfer Carthes of drop or 4 Perfect Steerable Transfer Carthes of rise. It is great for adjusting the height of a ball mount, bike rack or other hitch accessories. It has a max weight capacity of 7,500 lbs.