Folding Shelf, Material Steel, Finish Powder Coated, For Use With NEMA 4 and 12 Enclosures, Sub-Category Other Accessories, Application Support Laptop and Other Equipment During Maintenance/Inspection, Height 18 in, Length 18 in, Features Automatically Locks in the Horizontal Position When Raised, Shelf Takes Up Minimal Space Use the Hoffman(R) folding shelf for supporting computers and other equipment on enclosures.