410 STAILESS STEEL provides a strog material with excellet corrosio resistace idoors & outdoors i medium corrosive applicatios. BODED EOPREE WASHER provides a leak proof seal makig these screws excellet for roofig or sidig applicatios. #3 DRILL POIT allows screws to drill through .035 - .176 thick steel or alumium. These screws drill their ow holes prevetig you from pre-drillig. Used for attachig metal to metal. High Quality Screws that look great ad perform eve better.