The Seachoice Round Ventilator Cover will cover holes up to 2-1/2 inches in diameter. Designed to allow ventilation to confined areas, this cover is made of stamped stainless steel for excellent corrosion resistance. Seachoice is committed to delivering quality marine accessories and OEM replacement parts to satisfy fishing, boating and watersports enthusiasts worldwide. Seachoice is run for and by boaters, offering a wide-ranging product line while remaining affordable. Will cover ventilator holes up to 2-1/2 inches in diameterAllows ventilation to confined areasMade of stamped stainless steel for excellent corrosion resistanceDiameter measures 3-1/4 inchesAccepts (4) #6 fasteners (not included)