About the Milwaukee 05-81-0416 Self Tapping Phillips Head Screw, M4x16mm
A self-tapping screw to has the ability to advance when turned while creating its own thread. This ability is sometimes created by a gap in the continuity of the thread on the screw. These edges cut a thread as the screw is driven into the material. The cutting edge drills away from the material, leaving a hole for the screw to go into.