Self-Drilling Screws: Description: A Self-Drilling Screw isa Self-Tapping Screw with the added feature of a drill point. The drill point looks a lot like the point of a drill. It will drill a hole and form the mating threads in one operation. These screws have a wider and flatter head than typically round and pan head screws for a wider load distribution. Typically, useful for polycarbonate, metal and wooden sheets.