Metro Super Erecta 2148NW Industrial Wire Shelf, White, 21" x 48" Shelves can be repositioned at precise 1" (25mm) increments along the length of the numbered posts. Open-wire design minimizes dust accumulation, allows a free circulation of air, and greater visibility of stored items. Metro Product Type:Wire Shelf Material:Epoxy Coated Steel Color:White Warrenty:Product will be free from defects in material and workmanship under normal use, service and maintenance for a period of one (1) year from the date of shipment of the Product by Seller, unless otherwise specified by Seller in writing.