ARMSTRONG SELF DRILLING SCREW METAL (1, 1 1/2, 2)

Armstrong self-drilling screws for metal are designed for efficient fastening of metal components without needing a pilot hole. They typically feature a drill point that allows them to penetrate metal and a self-tapping thread to secure the connection. These screws are commonly used in metal roofing, construction, and other applications where speed and ease of installation are important.