Clamps are fully compatible with all other manufacturer’s racks and stands. Constructed of extruded aluminum with polished chrome plated cast alloy wing knobs. Mounting clips are user friendly and will not stick or jam. Wing knobs are guaranteed for life. The entire clamp is warranted for 10 years. Holds 100 sheets or 20 pounds and come with green color label holders. Packaged and sold six/box. Length 37¾". 9 lbs.