Suitable for hydraulic and pneumatic cylinder Excellent mechanical property Able to withstand high pressure impacting Nice straightness, minimum surface roughness and small wall thickness deviation Size range: Inner diameter: 14 to 320mm Wall thickness: 2 to 32mm Main standards: DIN 2391 and EN 10305-1 Main materials: 1020, 1026, 1045, ST45, ST52, E255 and E355 Delivery condition: cold finished (BK) Inner roughness: 0.8|¨¬m steel strips bundled,cover with plastic fabric,woven bag packed