KnuckleHead Stanchion supports are designed to support mechanical units, duct work and large pipes. Stanchion KnuckleHeads allow for height adjustment from 10 to 24 inches. Support units built using Stanchion KnuckleHeads offer incredible versatility with both height and width adjust-ability. If additional height is required this can be accommodated upon request. The KnuckleHead line is molded with glass-reinforced nylon which has aluminum like properties. Glass-reinforced nylon is tough, weatherproof, UV stable, and impervious to freeze-thaw cycles. Each KnuckleHead can support up to 600 pounds of weight. The standard universal base is 7 inches in diameter, the optional Big Base is 12 inches in diameter and is recommended in free-standing applications over 12" in height. The KnuckleHead line can free free-standing or mechanically attached using Green Link Adhesive/Sealant and/or fasteners.