The White Water deck plates are made from invest cast 316 stainless steel and mirror polished to a fine luster for a high quality addition to your boat deck. Deck plates come in inside diameters of 3" and 4" and are available with or without a star key opening pattern. The deck plate top is machine grooved and features a rubber o-ring for a water-tight steal. Deck plates can be used as cosmetic access openings in cabinets, doors, drawers, walls, helms, counter-tops and many other locations. Stainless steel key and mounting screws are not included.