Solid Stainless Steel and Galvanized Steel Shelves. Stainless shelves are made entirely of 304 series 16 gauge stainless steel. When cost is an issue, order the 18 gauge solid galvanized steel shelves. Plastic shelf clips are included. Cannot be used with Add-on units. Bringing You Closer To Home is a registered trademark of Medline Industries, Inc. Galvanized 18"W x 48"L