Sandusky Lee BM10361830-05 Dove Gray Steel Mobile Bookcase, 1 Adjustable Shelf, 200 lb. Per Shelf Capacity, 36" Height x 36" Width x 18" Depth Mobile bookcase with one adjustable shelf, one fixed bottom shelf, and four casters, is suitable for organizing, storing, and transporting books and other items Has welded steel construction for strength Center shelf adjusts in 1" increments to accommodate books and other items of varying heights Powder coat finish for resistance to chipping and corrosion Four 6" (H) swivel casters have 5" polypropylene wheels and brakes on two of the casters for maneuverability and control