What good are the toughest toolboxes in the business if they feel like they're mounted on wet noodles? Solid tool boxes deserve solid and sturdy mounting, that's why our Tractor Supply Co. Underbed Box Mounting Braces are constructed of heavy-duty steel with a protective black powder coat finish to keep them looking and performing their best. Mounted at each end of the box, these brackets and hardware provide maximum support for your Underbed toolbox.