Built for medium to heavy duty trucks, Buyers Products Heavy Duty Diamond TreadAluminum Step Box provides framed steps with convenient built-in storage space.The durable design incorporates a smooth aluminum body with a diamond treadaluminum door for great stability and looks. A die cast, locking T-latch andsingle rubber D-bulb door seal help keep your tools protected from weather andtheft. Corner gussets and a continuous hinge on the door opening provide extrastrength. Available in multiple sizes to suit a variety of applications. 24″ x 28″ x 18″ Utilizes the space under framed steps for convenient built-in storage Built with durable, corrosion-resistant, .125 in. thick smooth aluminum body and .100 in. diamond tread door with reinforced corners Thick integral corner braces provide mounting support for heavy loads and wide toolboxes Dust and grime can’t get past the built-in single rubber D-bulb door seal Shut out weather and theft with the locking, die cast T-latch and continuous hinge Made in the USA