Our Metal Bookcases are built to be a long lasting asset for your office. Choose from five different heights, two depths, and eight colors. Shelves and back are constructed from 22-gauge steel while the top and bottom are constructed from 20-gauge steel. Shelves are adjustable on one-inch centers, and extra shelves are available. Shelves may hold up to 200 lbs. if distributed evenly. Available colors are Putty, Tropic Sand, Black, Light Grey, Burgundy, Green, Blue, and Red. Ships Common Carrier.