ITEM NAME:2pcs Stainless Steel Boat Louvered Vent Cover Louver Ventilator Hardware Description: Vertical Rectangular Louvered Vent Cover+ Louvered style round vent cover Material: Marine Grade Stainless Steel Vertical Rectangular Louvered Vent Cover Dimensions: Approx. 23 x 11.5 cm / 9 x 4.5 inch Round vent cover Overall Diameter: 127 mm/ 5 inches Suitable for related vents in boats, marine, yacht, caravans, home Specification: Vertical Rectangular Louvered Vent Cover Material: Marine Grade Stainless Steel Dimensions: Approx. 23 x 11.5 cm / 9 x 4.5 inch Mounting Hole Diameter: Approx. 4 mm/ 0.16 inch Louvered style round vent cover Materials: 316 Stainless Steel Overall Diameter: 127 mm/ 5 inches Mounting Hole Diameter: 3mm/ 0.12 inch Package Includes: 2 Pieces Boat Vent Cover Note: Due to the differences between different monitors, the picture may not reflect the actual color. There is 2-3% difference according to manual measurement, please check the size carefully before you buy the item. SKU: DMO0016484419383939.Vertical Rectangular Louvered Vent Cover+ Louvered style round vent cover. Vertical Rectangular Louvered Vent Cover. Louvered style round vent cover. 2 Pieces Boat Vent Cover. Material: Marine Grade Stainless Steel.