The Sea-Dog Screw-Out Deck Plate is constructed with UV stabilized injection molded ABS and feature a clear polycarbonate lid, allowing visual inspection of the watertight compartment without removing the lid. When installing, use silicone sealant on hull or deck surface. Lubricate with Vaseline or Teflon grease. Keep threads clean with hot, soapy water. Installs with six #8 FH fasteners (not included). Avoid contact with acetone or strong solvent.