What is the name of the screw while the iron is hot?

Drill tail screw. Iron is a chemical element, not a crystal. Its chemical symbol is Fe and its atomic number is 26. It is located in the eighth group of the fourth period of the periodic table of chemical elements. It is the representative of iron group elements and the most commonly used metal. Screws for ironing are called drilling screws. The tail of the drill tail screw is in the shape of drill tail or sharp tail, which can directly drill, tap and lock on the setting material and basic material without auxiliary processing, thus greatly saving the construction time.