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. Round-head screws have a much more limited use in the building trades than flat-heads. Please Note: a round-head is a bit of a misnomer here, for the underside of the screw is flat. This is a very important feature of the screw, for this flat bottom side gives the screw its holding and binding power.