Adding a uniform surface across 21"d wire shelves to keep stored items in place, Chadko clear acrylic wire shelf liners provide protective benefits without being noticeable. Provides smooth surface on wire shelves Allows visibility of stored contents Rigid, 1/16" acrylic construction Moisture and chemical resistant Easy to remove for thorough cleaning Liners are cut-to-order and arefinal sale. Please measure shelves and see Product Details section below for exact sizing. To accommodate accessories used on wire shelves, liners must be custom cut. Please note in order comments box at checkout if needed.