Heartwork's Active Duty bookcases won’t let you down. Designed to be flexible giving you options to grow and change. Use them as space dividers, printer stands, an end cap on a desk or as a full wall of storage. Color code your office by function and or use the closed bookshelf as a magnetic board. Heavy duty casters make office moves simple. Endless possibilities. Heavy duty locking casters. 20 gauge steel. Four sizes in two different depths, 12 and 18 inches. 13 inches between each shelf. Weight limit: 200 lbs per shelf evenly distributed. No Assembly required. Lead time 8-9 weeks. Made in America.