Sea-Dog Line Screw Out Deck Plates, deck plate black standard 5in each NOTE: Avoid contact with acetone or strong solvents. Material: ABS Diameter: 6 3/4" Color: Black O-ring included: YesInjection Moulded ABS. Sea-Dog Line deck plates are moulded to the highest standards using top quality UV stabilizers and anti-oxidants. Use silicone sealant on hull or deck surface when installing the deck plate. Keep threads clean with hot soapy water. Lubricant with Vasoline or PTFE grease.