Extra heavy duty cantilever racks offer maximum support, strength and capacity for storing lumber and other long, flat items with ease. Made using 7 gauge steel uprights and 7 and 10 gauge steel arms. Scratch resistant gray enamel finish. Straight arms allow tool free height adjustments at 3 increments. Base can be used as bottom shelf for added storage. Includes one 71W horizontal brace set. Single Sided Units can be placed up against walls. Double Sided Units are great for center of aisles or rows. Starter Units include 2 uprights; Add-On Units include 1 upright. Add L Suffix for straight arms with 2H retaining lip.