Use with Atlantic metal mobile bookcasesMade of powder coated, textured welded steel. Shelves adjust at 2" intervals on alligator strips, eliminating lost or misplaced clips. Maximum weight capacity of 36" wide shelves is 200 pounds; capacity of 48" wide is 350 pounds. Available in 8 colors: -01 black, -02 blue, -09 grey, -18 red, -48 putty, - 53 burgundy, - 62 hunter green, -120 charcoal To view color choices, simply click on View Swatches button located below image.Overall dimensions: MB18: 3/4H x 36W x 18"D MB48: 3/4H x 48W x 18"D