Sea-Dog screw-out deck plate is molded to the highest standards using top quality UV stabilizers and antioxidants. Plate installs on hull or deck surfaces easily with silicone sealant. Easy maintenance includes keeping threads clean with hot soapy water and simple lubrication with vaseline or Teflon grease. Uses six #8 FH fasteners (not included). Note: Avoid contact with acetone or strong solvents. 5-3/4" overall diameter. 4-7/16" inside diameter.