Top Perch Pole Unit for pole system, Perch kit offers over 10 feet of perching/roosting area for martins to use around housing, Each kit attaches easily to system with two screws and contains: Six galvanized arms 1/4 in, diameter and approx 22 in, long, Zinc plated brackets and hardware, Dimensions (H x W x L) : 1 x 5 x 25, 5 SKU: GC2454