LBKYJ 4Pcs Boat Air Vent, 304 Stainless Steel Rectangle Stamped Louvered Ventilation Grille Cover 5" x 9" for Ship Yacht Kayaks

["Note: The polished surface may have characteristic fine scratches from manufacturing, which are normal and do not compromise the function or durability.","Stainless steel thickness Thick: 0.8 mm ( 0.031 inch ); Width:127mm ( 5 inch ); Length:228mm (9” );Whole Product thickness : 4.3mm (0.16 inch)","The area of the air outlet: Height of the air outlet: 3 mm (0.11”); Width of the air outlet:86mm (3.38”); Length: 165mm (6.49”).","Marine Grade 304 Stainless Steel Vent Grille Corrosion-Resistant","Polished 304 stainless steel Square Louvered Air Vent","Screw holes diameter: 3.7mm (0.14”),Not include screws","These vents can be use on Roofing, related vents in boats, marine, yacht, caravan, home"]