Reese Towpower Class III Interlock Ball Mount is rated for 500 pounds tongue weight and 5,000 pound gross trailer weight. The 2 inch square hitch bar has a 5-1/4 inch drop to level your trailer and add to the safety and ease of towing. This kit features a built-in interlock system that only one wrench is needed to tighten the hitch ball to the mount. Ball mount accepts 1 inch shank hitch ball.