... a lot of recognition from many customers since our good quality and service. 2. Production standard: ASTM A53, BS1387, EN10255, ... 3mm-219mm WT:0.8mm-8.5mm Length:12m PRODUCTBlack STEEL PIPE/painted/powder coatedTECHNIQUEWELDED/ERWMATERIALQ195,Q215,Q235,Q275, Q345 SIZEOUTER DIAMETER ... .1mmWALL THICKNESS:0.8mm-8.5mmMax Length:12mSTANDARDASTM,BS1387-1985,GB/T3091-200, JIS, DIN, EN, AS1074, EN39, A500 etc ...