OD:33.4mm THK:2.77 Standard:GB/T8162-1999,GB/T8163-1999,ASTM A53,ASTM A106,DIN1629 material:10#,20#,16MN,Q295 If you have any requirement among above items,pls feel free to contact me by MSN/Email:z_ysteel at hotmail dot com,i am at your complete disposal for any request.