Designed for use with 6K, 10K, 12K & 14K no-shank models of the original equalizer sway control hitch. You can accommodate most combinations of tow vehicle & trailer with one of our adjustable shanks. Fit standard 2 inch or 2-1/2 inch receiver tubes. Hitch head mounting holes are spaced at 1-1/4 inch on center & will work with many other brands of adjustable hitch heads.