1.we have MTC 2.ISO9001 certificate 3.more stock and good packing Quick Details Standard: GB, DIN, ASTMStandard: GB/T 8163-1999, GB/T 8162-1999, DIN 1...Grade: 10#-45#, 16Mn, A53-A369, ST35-ST52Grade: 10#, 20#, 45#, 16Mn, A53(A,B), A106(B,C)...Thickness: 3 - 58 mmSection Shape: RoundOuter Diameter: 21 - 390 mmPlace of Origin: Shandong China (Mainland)Secondary Or Not: Non-secondaryApplication: ...