The Sea Dog 6" Screw Out Deck Plate is best used as a replacement hatch cover. Deck plate comes with a rim and can be used for new installation or rim replacement. Rim and cover have threads, like a nut and screw, closes with several turns. The rim will not support a bag.Use silicone sealant between hatch rim and deck surface when installing the deck plate rim-flange. Features Top-quality UV stabilizers and antioxidants Hatch cover 6 inches in diameter Rim is 8 1/8 in. O.D Deck cut-out is 6 ½ inches, Overall width is 8" Color: Black Uses #8 Ovalhead Screws (sold separeately)