Similar to a Sheet Metal Screw, But It Has a Drill-shaped Point to Cut Through the Substrate to Eliminate the Need for Drilling a Pilot Hole. Designed for Use in Soft Steel or other Metals. the Points are Numbered from 1 Through 5, the Larger the Number, the Thicker Metal It Can Go Through Without a Pilot Hole. a 5 Point Can Drill a 0.5 in (12.7 Mm) of Steel, for Example.