Sheet steel screws are suitable for attaching sheets of steel, as their name suggests. They may also be useful for wood or to protected other materials jointly, but They are really principally utilized for sheet metal. It is usually designated that has a “PH” and is available in many sizes. https://typesofroofflashing47025.win-blog.com/9402386/rumored-buzz-on-types-of-screw-heads-for-screwdrivers