OD:26.7mm THK:2.87mm Standard:GB/T8162-1999,GB/T8163-1999,ASTM A53,ASTM A106,DIN1629 material:10#,20#,16MN,Q295 If you are interested in our products,pls don't hesitate to contact me on MSN/E-Mail:z_ysteel at hotmail dot com,any requirement ,we are at all your disposal.Hope we can establish good and long-term cooperation in near futher.