Strut Post Base, Single, 6" X 6" X 3-1/2", Steel/Electro-GalvanizedPost Base, 4 Holes Bottom Plate, Bolt Hole Diameter 9 16 in, Material: Steel, Finish: Electro Galvanized, Use with PS 200, 210 Power Strut, a part of Atkore, is a metal framing system that can be regarded as a basic building material. Our metal framing system is an erector set concept, using channel and fittings to solve many applications. You can conceal metal framing in the basic structure of a building or run it along the surface of walls, ceilings