Mobile bookcase ships assembled, just add the shelves; available in widths of 36" and 48"All-welded steel case features 1 fixed and 1 adjustable shelf that moves in 2" intervals on alligator strips, eliminating lost or misplaced clips. Shelf holds up to 200 lbs.Casters are sturdy 5" dia (2 locking) for easy mobility. Ships assembled via Truck. FOB: FLExtra shelves for 36"W (part number MB18) or 48"W (part number HMB48) bookcases available and sold separately Select from 8 durable, textured powder paint finishes: -01 black -02 blue, -09 dove grey, -18 red, -48 putty, -53 burgundy, -62 hunter green, -120 charcoalTo view color choices, simply click on View Swatches button located below image.Overall dimensions:MB4818: 48H x 36W x 18"DHMB4848: 48H x 48W x 18"DMB18: 3/4H x 36W x 18"DHMB48: 3/4H x 48W x 18"D