Aluminum Friction Hinge Hatch Porthole Window Window 5 Sizes Marine Boat Yacht Features: Friction hinge type hatch Anodized heavy-duty aluminum frames No sharp corners to snag lines or sails Spare parts available 10mm thick Acrylic glass Quick acting, adjustable tie down dogs 5 overall sizes to choose from: 350x350mm (13.8X13.8 Inch) 400X400mm (15.7X15.7 Inch) 450x450mm (17.7X17.7 Inch) 500x500mm (19.7X19.7 Inch) 550x550mm (21.7X21.7 Inch) Corner Radius: R75mm,R3 inch Material: Lens: tempered glass, Frame: Anodized Aluminum Glass: 10mm thick Acrylic glass,gray color Suitable for hull thickness: 1.1" - 2", 28-50mm for FRP/GRP/Wood boats The listing price does not include any destination duties/taxes/custom fees/etc that will be due when the product arrives at destination countries/regions. It is the customer's responsibility to pay for all custom duty/taxes/custom fees if any.