Description: Large clam shell ventilator Made from marine grade 316 stainless steel UV and weather resistant and great for routing cables, wire, etc. Used to seal and splash-proof openings for wire, hose, etc. Also perfect for locker vents. Item type: Boat Vent Cover Material: 316 Stainless Steel Color: Silver Size: approx. 58x55mm (large) 45*38mm(small) The package includes vent cover and screws.