Product name: Self tapping screw 
Standard: ANSI, ISO, DIN, BS, JIS, AS 
Material: Low carbon steel(, C1018, C1022), 
Surface: Zinc plated(yellow, black, green), black oxide, nickel plated, chrome plated, Cr+3, hot DIP galvanized, brass plated 
SEMS Screws for automotive and electronic indoustries