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. Lubricate with Vaseline or Teflon grease. Installs with six #8 FH fasteners (not included). Avoid contact with acetone or strong solvents. A 4 1/2" B 6 1/8" C 4 1/2" D 5 3/8" Finish Smooth Color White