We can provide screws according to: - ANSI (American National Standards Institute) - JIS (Japanese Industrial Standards) - DIN (German Industrial Standard) - BS (British Standard) - ISO (International Organization for Standardization) - GB (National Standards of the People's Republic of China) Material: Carbon Steel, Alloy Steel, Brass and etc. Heads: R: Round Head F: Flat head O: Oval head H: Hexagon head Slot Type: Slotted, Cross Recess ( Phillips ) and etc. Finished: White Zine, Black Zine, Blue Zine, Yellow Zine, Chrome, Nickel, Brass, Trivalent Chromium White Zinc, Trivalent Chrominum Color Zinc and etc.