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Drywall Screws
Drywall screws are mass-produced products, not hand-made artwork. In mass production, they are supplied to consumers with high-precision and stable quality and popular prices. The drywall screws are usually 6g grade (2 grade, American standard "IFI" is 2A thread), and the rough screw for construction engineering is 8g grade (3 grade, "IFI" is 1A tooth).
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