We privide the General Structural Seamless Steel Tubes Size: Outer Diameter: 5mm-115mm Wall thickness: 1mm-11mm Length: 3000mm-12000mm(we can do make the length as the customer requires. Standard: ASTM EN DIN JIS &GB. We can also provide specifications that the customer requires. If you have interest in us, or want to get more information from us, pls feel free to contact me. And we will be your best stainless steel pipe supplier in China.