black drywall screw C1022 material Dia:3.5, 3.9, 4.2 ,4. ... ,25,32,38,45,48,50,60... zinc plated & phosphated BLACK DRYWALL SCREWRaw materialC1022,C1018Diameter3.5mm,3.9mm,4.2mm,4 ... )ShankFine thread & Coarse threadSurfaceZinc plated ( yellow, white) & Phosphated (black, grey )Packing1000pc/box,500pc/box,10kg/carton,20kg/carton,25kg/carton black drywall screw/black screw