Sea-Dog Quarter-Turn Smooth Deck Plate w/Internal Collar - White - 8"Quarter Turn Smooth Deck Plate with Internal Collar White 8" The Sea Dog Quarter Turn Deck Plate is constructed of UV stabilized ABS. Features a new locking system that prevents over tightening, jamming, and cross threading. These deck plates also feature an internal, molded in collar on the bottom to hold deck plate bags or other round containers. When installing, use silicone sealant on hull or deck surface. Keep threads clean with hot, soapy water.