Perfect for access to the various storage areas on board and for inspection of fuel lines, electrical cables, gauges and controls as well as access to the engine. Features: Fine quality ABS material, anti-oxidation, sunshine-proof, long-term use does not age or fade, and the service time is longer. Separate design of cover and chassis for easy observation and maintenance. The product is waterproof and dustproof, corrosion resistant, impact resistant, high and low temperature resistant, suitablfor various environments. Reinforced design with a nonslip surface. Easy to use. Specifications: Size: 4in, 6in, 8in (optional) Color: black, white (optional) Material: ABS Inner diameter: 4in: 101mm 6in: 151mm 8in: 200mm Outer diameter: 4in: 143mm 6in: 198mm 8in: 250mm Package size: 4in: 160 * 160 * 40mm / 6.3 * 6.3 * 1.6in 6in: 210 * 210 * 40mm / 8.3 * 8.3 * 1.6in 8in: 260 * 260 * 40mm / 10.2 * 10.2 * 1.6in Package weight: 4in: 130g / 4.6ounce 6in: 240g / 8.5ounce 8in: 350g / 12.3ounce Packing List: 1 * Deck Inspection HatchCover