Reese Towpower Class II Interlock Ball Mount is rated for 300 pounds tongue weight and 3,500 pound gross trailer weight.  The 1-1/4 inch square hitch bar has a 2-1/2 inch drop to level your trailer and add to the safety and ease of towing.  This ball mount features a built-in interlock system that only one wrench is needed to tighten the hitch ball to the mount.  Ball mount has an 1 inch hole for ball shank.