Industrial shelving kit includes six shelves and compression clips. The box-beam shelf design and double-sided compression clips support heavy loads up to 900 lb. per shelf (evenly distributed). 20-gauge steel shelves lock into place and can be easily repositioned in 1" increments. Corner brackets help prevent rocking and improve overall stability and rigidity. A hat channel under every shelf increases overall strength. Shelving also features a durable, powder-coat finish. The required post kit (SAF6256) with four 85" high posts is sold separately.