Don from Voodoo Solar says:
"General Specialties builds what might be the very best post mount in the solar industry. I’m proud to offer this fine locally-made product. Main structural pieces are heavy steel construction, with quality aluminum rails for mounting the solar panels. Comes with instructions and hardware. You are certain to be pleased with this quality product, one look and you know you are getting your money’s worth. General Specialties universal post mounts really shine. The high-quality, heavy duty construction allows you to build a larger array in a single location, saving space, time, and money! As with all post mounts, you are required to supply the proper steel pipe which you buy locally. The larger mounts require the thicker schedule 80 steel pipe. Please note that these mounts are “universal” in the sense that they will hold nearly any brand of solar panel, but must be custom drilled to fit all but a few “standard” models."