. Add-On shelving units allow unit expansion to make the most of storage space. Includes 2 posts with leveling feet, 5 shelves, snap-on sleeves and joiner clamps to join units. Solid Galvanized steel shelves feature a dual layer construction that provides strength and rigidity and is temperature and moisture resistant. Solid shelves allow for display storage of small equipment and instruments. 18 Gauge. Raised lip surrounding the edge of each shelf to prevent spills from overflowing. Open styling to allow shelves to be reached from all sides. Includes 5 shelves, 2 posts, snap-on sleeves and joiner clamps to join units. Shelves easily adjust without tools at 1 increments. NSF approved for wet or dry use.