The 1800 Series low profile stainless steel hatch features a mirror-polished lid that is mounted to an aluminum base with beautifully sculpted hinges. A double wide gasket eliminates the potential for leaks. A quick turn collet arm allows the hatch lid to be held in any position from 0 to 90°. Scratch-resistant tempered glass lens. Locked vent position. Inside/outside opening locking dogs. 20-1/4" square.