All of our chrome wire shelving add-on kits are NSF certified for use in food service and medical fields. This means, when you attach an add-on unit to your existing starter unit, you can enjoy the benefits of using this shelving in your kitchen or pantry without worry. By replacing adjacent posts with S-Hooks that join the shelves together, you can create a long row of storage, L-shaped corner shelving, or U-shaped wall-to-wall shelving.