1.Astm A193,Din931/933/975 2.Finish:Self Color,Black,Teflon Coating(PTFE) Black, White,Blueness Zinc,Nickel Plating ... .21.1, DIN125, DIN9021, DIN 127, DIN 7980.Finishing (Surface): Self Color, Xylan. Black ,Teflon Coating (PTFE) Black, White or Blueness Zinc ...