Just like all of our Pro Series Tool Boxes, this box is made from .120 aluminum. With an outside dimension of 36" long x 18" tall x 18" deep this box is perfect as an ad-on or for use alone in tight spaces. Like all our Pro Series Boxes, the 36" box comes predrilled for all ITD accessories. Just pop out the plastic plug in the pre-drilled holes and bolt the accessory on. From a bolt on storage fender to a bolt on shelf; having your tool box set up the way you want it has never been easier. Watch the video to learn why the Pro Series boxes were built for those of you who make your living with your trucks.