High Quality: Made of solid ABS material, Weather-tight and Anti-aging, Anti-corrosive, Ultraviolet resistant. Widely Application: This marine access hatch suitable for all kinds of Boats/Yachts. Ideal for interior and exterior applications. Product Features: Smooth surface, reinforced design with a non-slip surface; 180° opening hatches, 4/6/8 inch deck plate. Easy to Install: Rotary switch. Separate cover plate and chassis, Pre-drilled countersunk holes (screws included). Products Size: 4 inch – Cutout Size 4.4″ (112mm) O.D 5.5″ (141mm) I.D 4″ (101.6mm); 6 inch – Cutout Size 6.5″ (164mm) O.D 7.8″ (198mm) I.D 6″ (152mm); 8 inch – Cutout Size 8.25″ (209mm) O.D 9.7″ (247mm) I.D 8″ (203mm). Package: 1x Boat Deck Hatch & Screws included.