Reese Towpower Carbon Forged Interlock ball mount bar features a uniquely innovative forged one-piece construction with unequaled quality. It is designed to offer greater towing capacity and performance in a unique weld-free construction with a durable high quality finish. The Reese Interlock design is a patented hex design which allows for a one-wrench tightening system when combined with a Reese Interlock hitch ball. It makes for installing the hitch ball more efficient and prevents marring of the hitch ball.