Screws, Nails, Rivets manufacturer / supplier in China, offering 3.5/3.9/4.2mm Carbon Steel Black Drywall Screws for Plasterboard and Thin Steel Sheet Gypsum Board Screws Metal Studs Screws, C1022 Screw Black Zinc Phosphated Bugle Head Phillips Drive Coarse Fine Thread Screws Gypsm Drywall Screw Drywall Fixings Screw, Standard Wood Screw Coarse Thread Fine Thread with Balck Phosphated Corrosion-Resistant Screws Gypsum Board Screws and so on.