The VentSaver FB-151 Series is made from non-corrosive, powder-coated aluminum with a pre-punched stainless steel strap to fit smaller sizes of pipe from 1.5" - 4". Also provided are stainless-steel nuts, bolts and heavy duty 1 1/2" lag screws. It protects a standing profile of 6". Installation is quick and easy. This is not intended for standing seam metal roofs.