... material:carbonsteel 3.finished:zinc coated 1.Standard of Sheet Metal Fabrication : DIN 933/931/912 ... /97, DIN7995, DIN7997, BS1210, BS1210 Hardened2)Size of Sheet Metal Fabrication : M2.5-M6, 2#-14 ... : 6A,8A,brass,stainless steel and so on.4)Surface of Sheet Metal Fabrication : plain, zinc Cr+3 ... steel, construction, industry, daily life or other metals to fasten metal or other hard materials. Countersunk ...