A job screw is a type of a self-drilling screw which means that they are designed to have drill bit points that can bite into the metal. This means drilling would be lessened and the amount of time and effort required for you to complete your project would be reduced. However, there are a few things to consider when deciding which self-drilling screw to use. The first thing to consider is the flute length. The flute’s purpose is to extract the drilled material from the hole, if this becomes blocked, then cutting will be hindered. The flute length needed to complete your project would depend on the thickness of the metal you will use your screw on. Next consideration would be your drill point. When choosing which screw length to use, always take note of the material you plan to drill through. If the threads of the screw prematurely engage even before the drill point has perfectly passed through the material, screw breaking could be expected.