Highland Cow 30cm Flat Rimmed PlateLarge porcelain dinner plate, 30cm (12 inches) in diameter, is made from hard wearing porcelain, microwave, oven and dishwasher proof. Flat rimmed plates have a rim that rises gradually so they still hold food with sauces well, having a depth of 2. 8cm (1 inch). You can also lay wide ingredients on the plate coming onto the rim, like fish or asparagus.