316L Stainless Steel Rectangular Portlight Porthole Hatch Window Marine Boat For each porthole size, It has two suitable hull thickness models: Standard Model: Suitable for hull thickness between 1.0~1.4 inch(26~36mm), for FRP/GRP/Wood boats. Super Thin(ST) Model: Suitable for hull thickness between 0.24~0.63 inch(6~16mm), for Aluminum/Steel boat boats. The porthole is made of 316L marine grade Stainless Steel. These portlights are stamped giving them a high-end quality appearance at an economical and affordable price. They are good for FRP, GRP, wooden, aluminum and steel boats. Specification: Brand: Galamarine Rectangular Shape 316L marine grade stainless steel, mirror polished 3 Overall sizes to choose from: 150345mm (5.913.6 inch) 200460mm (7.918.1 inch) 250x575mm (9.8X22.6 inch) Acrylic Thickness: 3/8 inch or 10mm Acrylic Color: Smoked Mosquito screen is supplied. 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.