Tub-style shelves prevent books, videos or supplies from fallingFrame is constructed of 16-gauge steel with 1" round tubing. Three tiers of 20-gauge steel tub shelves have 4" retaining walls to hold materials in place. Silencer mats under each shelf assure "library quiet" performance. Handles are curved for comfort.Tub shelves have a depth of 16" and clearance of 12 1/2".Includes 4 non-locking, ball-bearing swivel casters in your choice of 4" or 5".Caster assembly required.Ships via Truck. FOB: ILAvailable in 9 colors: -01 black, -02 blue, -08 desert sand, -18 red, -48 putty, -53 burgundy, -55 navy, -94 medium grey, -134 dark greenTo view finish choices, simply click on View Swatches located above.Overall dimensions:73 (4" casters): 39 1/4H x 30W x 17"D73C (5" casters): 40 1/4H x 30W x 17"D