Beckson Marine 5" Twist-Out Deck Plate - Black. The low profile cover is self-centering and quickly locks in place with a 1/8 twist. Three seperate sealing areas each designed to chase water away from the plate opening assure a watertight closure. The bayonet threads are non-jamming self-cleaning and lift at the center for easy removal. O.D.: 7" I.D.: 5" Hole Cut: 5-1/2" Package Contents: Beckson Marine 5" Twist-Out Deck Plate Beckson Marine DP50-B: 5" Twist-Out Deck Plate - Black