16K heavy duty ball mount 6 inch drop 6 inch shank Useable shank length: 10 3/4 inches Rise: 5 inches Pinhole: 5/8 inch Ball hole size: 1 1/4 inches Pinhole to support: 2 1/4 inches Pinhole to shank: 2 1/2 inches 16,000 WC/1,600 VWC pounds