Tough STRUCTURAL PLASTICS Dura-Shelf All-Plastic Industrial Shelving with Adjustable Shelves stores practically anything including chemicals and corrosives. Sets up quickly without tools. Rigid high-density polyethylene shelves are 2-5/8" thick. Adjustable shelves slide up and down legs in 4" increments and are held in place using a pin lock system. Available with open grid shelves or solid shelves with higher capacities. Made in USA.