... :specil design available according to requirement.Black square tube with A53 material 1,mild steel 2,10-15days delivery time 3 ... *200mm 4,ISO.BV.QC certificate Black square tube with A53 materialDimensions:15*15mm -200*200mmThickness:0.6mm-12mmLength: 4-9mDelivery ... , Q345, St33, St37-2, SS330, SS400, ASTM A 106B, ASTM A53, X42Quality:Manufactured to meet ISO9001, ASTM, API, SAE, DIN, BS ...