Zinc Coating: 275-350G/M2 Material: 10#,20#,35#,45#,20G,40Cr,20Cr,16Mn-45Mn,27SiMn,Cr5Mo,12CrMo(T12),12Cr1MoV,12Cr1MoVG,10CrM Zinc Coating: 275-350G/M2Material: 10#,20#,35#,45#,20G,40Cr,20Cr,16Mn-45Mn,27SiMn,Cr5Mo,12CrMo(T12),12Cr1MoV,12Cr1MoVG,10CrMo910, 15CrMo,35CrMo,40CrMoO. D: 20-219mmO. D Tolerance: ± 0.03W. T: 0.9-16mmLength: 2--12m, As customers requireInternational Stancard: BV, SGS, ...