What information does the special head screws need to provide?

What information does the special head screws need to provide?: Years ago, Mr. Li found Shi Shi Tong on the Internet and asked if we could customize special head screws. In the drawings provided by Mr. Li

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stainless flat head screws, surface a variety of color can do it?

What effect does washer head screws have?

Die Spotting Extra Long screw