A: Size:1) Round pipe diameter: 16mm-219mm, thickness: 0.8-10.0mm2) Square tube: 16 x 16mm-400 x 400mm, thickness: 0.8-12.0mm3) Rectangle tube: 19 x 10mm-500 x 300mm, thickness: 0.8-12.0mmB: Surface finish: black, blank, bright and galvanized C: Length of each pipe: 500mm-16,000mm D: Steel grade: Q195 - Q235A, ST37-2, S235, S355, SS400, A1010E: Conforms to international standards, like: ASTM A53, ASTM A500, ASTM A513, BS1387, DIN2394, JIS G3452To date, more and more clients, ranging from China to Japan, Korea, Southeast Asian Nations and part of American and European countries have started to select our products, which have won a good reputation both at home and abroad. We are sure that from pure-hearted cooperation we can establish good relationships. Feel free to contact us, we are sure to satisfy you with our professional information, top quality products, best price, and efficient services. For all details, please never hesitate to contact us. producing area:China payment:L/C at sight or T/T supplying capacity:6,000MT/month