Compatibility: The Dump Truck Trailer Hinges is fit for 2" rectangular tube (4", 5", 6" or wider) High Grade Material: The dump hinge are made of heavy duty steel. The surface is treated with special oil to avoid rust and effectively extend the using time Practical Tool: You can use the dump hinge to replacement of the old or damaged Easy to Install: Direct Weldment Package Included: You will receive 2 pack dump hinge, without mounting accessories and instruction