... 3.finished:zinc coated 1.Standard of Sheet Metal Fabrication : DIN 933/931/912,DIN 960/961,IS0 ... /ASME B18.2.1 IFI A101)Standard of Sheet Metal Fabrication : DIN95/96/97, DIN7995, DIN7997, BS1210, BS1210 ... Hardened2)Size of Sheet Metal Fabrication : M2.5-M6, 2#-14#3)Material of Sheet ... steel and so on.4)Surface of Sheet Metal Fabrication : plain, zinc Cr+3,Yellow Zinc Cr+6 ...