Drywall screw C1022 carbon steel ,hardened coarse thread, fine thread , black phosphate , grey phosphate, zinc plated Drywall screwC1022 carbon steel ,hardened coarse thread, fine thread ,black phosphate , grey phosphate, zinc platedsize: 3.5mm--4.8mm(6#---#10)length: 13mm---150mmpacking :1000pcs/box , 20--25kg/carton or as customer special request. Drywall screw, black phosphated