... ,BS916, ISO4032,ASTM 194 2.Material:carbon steel,stainless steel, brass Standard: DIN934/555, DIN936/439, UNI5587, IFI D6/D12, BS916 ... : Low carbon steel, carbon steel 35#, stainless steel, brass,copper, aluminum Surface: Plain, Black, Zinc Cr+3, Yellow Zinc Cr+6, H ...