Combined with interlock ball mounts provide a one wrench tightening system Place the hitch ball shank through the hole of the ball mount align the hex shapes and tighten to specification When installing torque all 3/4 shank balls to 160 ft lb and all 1 to 250 ft lb. 2000-LB CAPACITY 1-7/8 Ball Diameter Shank Dia x Lgth=1 x 2