[Sturdy Material] Made of high-quality and ABS engineering plastics. It has excellent characteristics such as high strength, good toughness, anti-aging, anti-ultraviolet, and good heat resistance. Even if exposed to the sun for a long time, it is not easy to deform and become brittle. Excellent resistance makes it in rain and sea water environment. High impact resistance also allows it to be installed in places exposed to heavy treads, such as ship decks. [Anti-Skid Design] Circular Non Slip Inspection Hatch is designed with square concave-convex , which is non-slip and wear- to prevent people from falling. It also gives people a luxurious visual effect and a pleasing feeling. Carefully polish and trim the edges, smooth and not cut your hands. [Excellent Sealing Performance] Inside Round Non Slip Inspection Hatch built with rubber sealing ring and thread make Boat Hatch Deck Plate have better sealing performance. Better waterproof and dust-proof effect. [Easy to install and use]This Detachable Round Deck Plate is easy to install, detachable design, no need for professional installation skills and complicated tools. Old equipment can be replaced directly. 180°opening hatches, cover and chassis, allowing vertical or horizontal installation, and a range of applications. we intimately equip you with 6 pieces of screws, which are convenient to install and remove. [Wide Application] Boat Deck Plate can be used for inspection and maintenance ports of ships, yacht, RVs, campers, etc. Tip: When installing the inspection hatch, please use silicone sealant on the of the hull or hatch(Not included) Colour: Black Material: ABS Size: Inner Diameter: 4 inches, Outer Diameter: 5.5 inches, Cutting Size: 4.4 inches. Package Contents: 1 x deck cover Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.