Adjustable Shank. Designed for use with the 6K, 10K, 12K, and 14K no-shank models of the Original Equalizer Sway Control Hitch. You can accomdate most combinations of tow vehicle and trailer with one of our adjustable shanks. Fit standard 2" or 2-1/2" receiver tubes. Hitch head mounting holes are spaced at 1-1/4" on center.