Reese Towpower Interlock ball mount bar has a hex design which allows for a one-wrench tightening system when combined with a Reese Interlock hitch ball. It makes installing the hitch ball a more efficient and quick process, and prevents marring of the hitch ball. It is not limited for use with the Interlock model and can easily be used with any standard hitch ball. Black powder-coat finish resists corrosion and lengthens service life. 2-1/2" bar drop. 3/4" hole size. 2" rise. 3,500-lb. weight limit.