While most wood screws are made out of steel, it's better to use copper, brass, bronze or nickel screws for jobs where there's a risk of corrosion. These are extremely high quality solid brass material to be used in wood working conditions. Whether you are looking for corrosion resistance or the 'beautiful brass look" these screws could be your ideal choice. Oval Head screws are preferred over flat heads in conical applications, or when a more decorative finished look is desired. The countersunk surface nests into mating countersunk application sites