A3 Frame with Mount For A4 (Or 12x8) Print / Picture / Photo │ 25mm Matt Black Picture Frame with White Mount Frame Size is 420 x 297 mm. Exact mount aperture measures 292x197mm. Mount Card Thickness is 1.5mm All of our A3 size Picture Frames with mounts are Handmade with love here in the UK Made from REAL wood with GLASS these photo frames can be Wall Mounted either Portrait or Landscape. A3 (42 x 29.7 cm) inch Mount | White in Colour. With white core inside, meaning the bevel won't fade or yellow