This adapter raises a 50mm square, 2-inch hitch carrier by approximately 180mm. The hitch carrier insertion opening is 51.6mm square internally, so it can be used with CURT 2-inch square hitch carriers. The hitch member insertion side is 50mm square externally. We have not performed strength calculations, so we cannot give a precise answer. The material used is 4.5mm thick for the side inserted into the hitch member, and 4.2mm thick for the side that attaches to the hitch carrier, so please compare it to the thickness of the steel used in your planned hitch carrier as a guide. Please use this for hitch carrier use on low-floor vehicles. The bolts attached near the insertion opening are for preventing rattling. The material is steel. The distance from the center of the upper square pipe to the center of the lower square pipe is approximately 180mm. Please be aware that the back door may interfere depending on the vehicle you are using. It is matte black painted and is a new, unused item, but it may have scratches or uneven paint, so please refrain from bidding if you are concerned about the finish. We are not responsible for any injuries or accidents that may occur while using the product.