Detailed Product Description Hardware>>Fastener >>Screwdrywall self-tapping Screw 1.Standard:GB BS JIS ANSI DIN Or Non-Standard.2.Dia:3.5(#6),3.9(#7),4.2(#8),4.8(#10)3..Length:1/2",3/4"5/8".1",2",2-1/2"......4"4.Surface:YellowZinc,Black,Blue,Nickel,Galvan-coating Material:SteelC1022,harden higher resistance for special applications.High quality & Best competitive price. Strictly quality man power ...