Made with high-strength steel and a solid construction, the CURT 2 1/2" WD replacement shank is made for heavy-duty towing. With a shank that fits any 2 1/2" x 2 1/2" receiver tube opening, it eliminates the need for reducer sleeve or an adapter, and it offers the strength necessary to tow the heaviest of RV travel trailers. While the receiver tube shank measures 2 1/2" x 2 1/2", the vertical shank offers a universal fit to be compatible with most CURT weight distribution hitches. Holes in the vertical shank are spaced 1 1/4" center-to-center and have a 3/4" diameter, allowing for a maximum rise of 4 3/4" and a maximum drop of 7 1/2".The 2 1/2" replacement weight distribution shank is compatible with any 2 1/2" trailer hitch, including our Class V Xtra Duty and Commercial Duty hitches. | Curt 2.5" Weight Distribution Shank, 2" Drop, 6" Rise, 15K