Beckson 5" Twist-Out Deck Plate - BlackTwist Out Deck Plate The Beckson Twist out Deck Plate is designed to conceal its mounting fasteners under the quick twist cover. 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