Space-saving rolling storage bins hold 12 -20 rolled documents Wire roll files are constructed with a tubular steel frame surrounding chrome-plated grids to hold rolled documents such as maps, blueprints and more in a compact space. Bins roll smoothly from desk side to storage area on 2 1/2" diameter casters that are 1/2" below the full-width flat bottom shelf. Dust guard at the bottom keeps materials clean while protecting their edges. Choose from 2 sizes: 12 slots or 20 slots Assembly required. Ships via Ground Transportation. FOB: MN Available in light grey color. Overall dimensions: SF3090: 23 3/8H x 18 1/4W x 14 1/2"D, with slot size of 3 3/4"W SF3091: 23 3/8H x 18 1/4W x 14 1/2"D, with slot size of 2 3/4"W