black drywall screw C1022 material Dia:3.5, 3.9, 4.2 ,4.8 ... Length:16,19,25,32,38,45,48,50,60... zinc plated & phosphated BLACK DRYWALL SCREWRaw materialC1022,C1018Diameter3.5mm,3.9mm,4.2mm,4.8mm……Length1/2”-4”(13,16,19,25,32,35,38,41,45,50,60,63,75,80,90mm)ShankFine thread & Coarse threadSurfaceZinc plated ( yellow, white) & Phosphated (black, grey )Packing1000pc/box,500pc/box,10kg/carton,20kg ...