The Vialux 558 convex traffic mirror can view in two directions covering an angle of Approx. 90 degrees. It is designed to be positioned at junctions with obscured visibility to prevent accidents. Easy to install & adjust to the exact position required Unbreakable Very light yet withstands severe weather conditions Supplied with bolts & brackets for fixing to walls or to 60-90mm diameter posts 3 year Polymir guarantee