Universal Builder's Kit. Includes two 5' straight pipes, and two 45 degree, two 90 degree, and two 180 degree bends, all with extra straight lengths. One end is expanded to id fit for slip-fit connections. Can be clamped or welded. Made from aluminized steel (304 and 409 stainless steel also available). See our hardware section for a full selection of clamps, hangers, and other hardware.