Cover Plates are constructed of a durable brass or chrome alloy with a concealed hinge for covering existing floor sleeves, All attachment screws are concealed when cover plate is in closed position, allowing for a completely flat and safe playing surface, Standard cover plates have a 5"" Inside Diameter, with a total diameter of 6-1/4"", Oversized cover plates have a 6-5/8"" Inside Diameter, with a total diameter of 8"", Please refer to the product description below for cover plate size and finish, SKU: GSPRT106