Hex head self-drilling screw for use in steel sections, brackets, assemblies, and other metal products to fasten through mild steel. This screw is an all-purpose tool with endless uses in the steel building industry, but it also has fast installation qualities since the coarse thread instals a little more quickly than the fine thread version. They are ideal for both interior and external applications because to their flanged hex head, which contributes to excellent pull-out strength.