Product details:

Open wire shelving permits sprinkler, air and light penetration and minimizes dust accumulation. Easy slide-off shelf surfaces speed stocking and picking. Wire shelves adjust without tools and align on numbered posts at 1 increments. Meets NSF standards. Easy assembly. Starter Shelving Unit includes 4 posts with leveling feet, 4 shelves and snap-on sleeves to secure shelves to posts. Add-On Shelving Units allow unit expansion to make the most of your storage space. Includes 2 posts with leveling feet, 4 shelves, snap-on sleeves and 8 S-hooks to join units.