Sandusky Lee BM20361842-09 Black Steel Mobile Bookcase, 2 Adjustable Shelves, 200 lb. Per Shelf Capacity, 48" Height x 36" Width x 18" Depth Mobile bookcase with two adjustable shelves, one fixed bottom shelf, and four casters, is suitable for organizing, storing, and transporting books and other items Has welded steel construction for strength Shelves adjust 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