A self-drilling tip include a drill point to drill a starting hole so the threads of the screw can cut and tap into the material, securing it into place.
Point Length : Teks screw are distinguished by the length of their drill point. They can be either Tek 1, Tek 2, Tek 3, Tek 4, Tek 5 or Tek 7. Tek 7 being the longest drill point.
Sealing washer : A sealing washer will be added when the connection needs to be waterproof, in roofing application per example.
Wings: Also called Reamers, they are added when attaching wood to metal. They are small portions of metal just above the drill point that make a wider hole in the wood so the threads do not engage until they reach the metal material. Once the wings hit the metal, they snap off.