Sheet metal screws have a fully threaded shank with sharp threads and tip that allow them to cut
through metal, wood, plastic, and various other materials. The size of sheet metal screws are
commonly shown as a series of three numbers, these numbers represent the diameter, thread
count, and length of fastener.

• Fully threaded shank. 
• Very versatile fastener, can be used in metal, wood, and plastics.
• Most are self-tapping screws and only require a pre-drilled hole, some come with self-drilling
  tips.
• Specially hardened, sharp threads that allow it to cut into material and form its own internal
  thread.