Advantage: Excellent mechanical property. Able to withstand high pressure impacting. Nice straightness, minimum surface roughness and small wall thickness deviation.Main standards: DIN 2391, EN 10305-1, ASTM A 519.Main materials: 1020, 1026, 1045, ST45, ST52, E255 and E355.Delivery condition: cold finished (BK).Inner roughness: 0.8μm.Inner diameter: 14 to 320mm.Wall thickness: 2 to 32mm.Application: Suitable for hydraulic and pneumatic cylinder.Zhejiang Dingxin Steel Tube Manufacturing Co., Ltd.ISO9001, TS16949.Contact person: Lisa Hsu,sales04[at]dingxintube[dot]cnMobile:+86-15669301195