Thank you for your custom.Customer care is our top priority. Offer is subject to availability.We promise you won't regret buying it. MARINE-GRADE MATERIAL:5" Boat Round Inspection screw-in deck plate with Clear Lid is made of anti-aging, anti-corrosive, and UV-resistant white plastic with a smooth finish LEAK-PROOF DECK PLATE:It is designed with a rubber O-ring that creates a watertight seal for safety and allows it to be used for interior and exterior applications EASY INSTALLATION:Screw-in style has a single-start, non-jamming, and no cross-threading. Separate cover plate and chassis for easy installation. 6 #8 Screws Needed (not included) MEASUREMENTS:Inside Diameter:5" (127mm), Outside Diameter:6-3/4" (172mm), Cutout:5-1/2" (139mm), Distance Between Mounting Holes:6-1/4" (159mm) SAFETY:Access includes a safety lanyard to secure the clear lid cover. Please, use silicone sealant on the hull or deck surface when installing the deck plate. , 40 Years Developing High-Quality Marine & Outdoor Products