WoodPro Washer Head Screws are coated by PPG Industries with an industry leading 1,500 hour Electro-Polyseal coating for consistent layering that prevents recess fill while offering superior corrosion protection. The stronger PPG coating helps prevent chipping for added exterior corrosion protection. The secure STAR drive helps reduce bit slippage and a sharp Type-17 point with a patented ASTER thread provides quick starting and effortless drilling. These screws can be used for a wide range of interior and exterior applications. Primary applications include: Post to pole framing, Insulation panels.