See All SSO42 Circular Stainless Steel Outdoor Convex Security Mirror with Back, 42" Diameter (Pack of 1) Circular convex mirror reflects a wide angle image at a diminished size to extend a field of view Helps a person see around obstacles for safety, or monitor a wide area for efficient surveillance 20-gauge, grade 304 stainless steel, nickel- and chrome-plated for a corrosion and weather resistant surface that reflects a clear, bright image Stainless steel backing for resistance to impact, fatigue, wear, and weather in outdoor applications with extreme temperatures or high winds Comes with mounting hardware that makes the mirror angle adjustable after installation