Waldorf Collection Polished Stainless Steel Finish 21” Frosted Glass Shelf. 21.9” Length from Center to Center x 5.8” Total Width (5.6” Glass Width), 1” Mount Diameter. Waldorf Collection Polished Stainless Steel Finish 21” Frosted Glass Shelf. 21.9” Length from Center to Center x 5.8” Total Width (5.6” Glass Width), 1” Mount Diameter. If you have any questions please call 212-832-4200