BACKRACK™ hardware kits are available in both no-drill and low profile designs. The TOOLBOX-31" no drill Hardware Kit is designed to accommodate a standard 31" cross bed Toolbox. The Toolbox sits on top of the Toolbox Brackets allowing you to slide the Toolbox forward so that bed space is not wasted. The Toolbox is secured to the TOOLBOX BRACKETS by drilling sheet metal screws through the Toolbox and into the top of the TOOLBOX BRACKET. Drill and bolt is also acceptable. Clamp hooks that come with the Toolbox are not required. Not compatible with TONNEAU COVER ADAPTER Brackets.