Horizontal beams are roll-formed to a Z-profile for added shelf capacity. Decking sits flush to beams for neater appearance and stability. 2-1/4 x 1-1/2 x 14-gauge uprights. Boltless, interlocking beams with double teardrop postholes assemble quickly and without tools. Levels adjust at 1-1/2 increments. Includes sturdy, precut 5/8 particleboard, an economical choice for decking. gray baked enamel finish. This Starter Unit includes 4 angle posts, beams for 3 levels and decking.