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The Inspection Hatches with Detachable Cover are made of tough plastic for extra resistance to the sun, water, salt and detergents containing acetone. They have no hinges, so that you can completely remove the cover. Their opening is easy, since the specially designed thread automatically ejects the cover, once you turn it 90o counter clockwise. Furthemore, they feature non-skid surface and hidden screws for smarter appearance.