Marine and Boat Mirror Glass Cut to Size Precision-cut 2mm flat round silver mirror glass for suitable boat, yacht, caravan and motorhome interior mirrors. These UK-made circular mirror blanks are available in 1mm diameter increments for replacement, restoration and custom cabin projects where flat mirror glass is required. Wet-finished front and back edges provide a clean fit into appropriate frames and holders. Measure the opening carefully and ensure the mounting method protects the glass from movement, impact and unsuitable environmental exposure.