Features: 1. Promote Air Circulation: Excellent ventilation effect ensures air circulation and freshness inside the vessel, improving cabin comfort. 2. Thoughtful Design: Equipped with a convenient knob; turn the side knob to control the opening and closing of the ventilation door for easy operation. 3. Stainless Steel Construction: Made of high-quality stainless steel with a precision mirror-polished surface, offering high strength, rust resistance, and durability. 4. Applicable Applications: Specially designed vent mounts in the cabin to provide ventilation for doors, cockpits, and cabins, meeting functional requirements. 5. Practical Accessory: Air vent gill plate suitable for marine boats, yachts, and RVs; reliable marine hardware for long-term performance. Specifications: Item Type: Cabin Ventilation Plate Material: Stainless Steel Includes side grip knob to adjust air vent size Edge mounting holes are 3.5 mm (0.138 in) in diameter, compatible with 3 mm bolts or rivets Application: Suitable for marine boats, yachts, and RVs