Mid size wallplates - stainless steel telephone and coax superior non-corrosive and non-magnetic properties for applications needing protection from those elements. 302/304 stainless steel alloy contains 18% chromium and 8% nickel for corrosion resistance. stamped from 0.032 in THK material. horizontally satin brushed surface finish resists finger prints. matching stainless steel mounting screws provided.