Tough STRUCTURAL PLASTICS Dura-Shelf All-Plastic Industrial Shelving with Fixed Shelves stores practically anything including chemicals and corrosives. Sets up quickly without tools. Rigid high-density polyethylene shelves are 2-5/8" thick. Fixed open grid shelves promote air circulation, prevent dust buildup and allow liquids to flow through. Start with 2-shelf base unit and attach 1-shelf add-on units to reach your desired height. Posts snap in place via a locking collar system. Made in USA.