Black Galvanized Torx Self Drilling Screws a) Material:Carbon Steel b) ... for fast drilling with less effort needed. Select the point size base on your light / medium / heavy duty work. DRILL POINT ... CodePhillips, Pozi, SlottedGrade4.8, 6.8, 8.8FinishPlain, Zinc Plated, Black/Grey Phosphated, Nickel, Brass etc.StandardGB, DIN, ANSI, JIS, BSW ...