These Screw-Out Deck Plates feature a clear polycarbonate lid, allowing visual inspection of the watertight compartment without removing the lid. These Screw-Out Deck Plates feature a clear polycarbonate lid, allowing visual inspection of the watertight compartment without removing the lid. Lubricate with Vaseline or Teflon grease. Keep threads clean with hot, soapy water. Avoid contact with acetone or strong solvent. Constructed of UV resistant injection molded ABS and polycarbonate. Installs with six #8 FH fasteners (not included). When installing, use silicone sealant on hull or deck surface. Available in black or white. Cutout: 6-1/2" Overall: 8-1/8"