Button snap studs for boat covers, winter covers, canopies and tarps * Galvanized steel screw with nickel-plated steel snap for superior rust & corrosion resistance * 1/4" barrel, 3/8" outside diameter snap; 5/8" #8 screw with Phillips head * Excellent quality suitable for marine applications; made in Taiwan * Sold in sets of 25 - for big projects order extra sets; snap caps available separately