Detailed Product Description Hardware>>Fastener >>Srewchipboard self-tapping screw 1.Standard:GB BS JIS ANSI DIN Or Non-Standard.2.Dia:M3,M4,M5,M63.Length:6-50,8-60,10-100,10-1504.Surface: Yellow Zinc,Black zinc,Zinc-plated Material: SteelC1018,C1022Harden higher resistance.High quality & Best competitive price. Strictly quality man power sorting and inspection. Professional strong technique team ...