... before 20 daysSpecifications1:specil design available according to requirement.Black square tube with A53 material 1,mild steel 2,10-15days ... A 106B, ASTM A53, X42Quality:Manufactured to meet ISO9001, ASTM, API, SAE, DIN, BS, GB and SY requirementsApplication: Widely used in ... provide for you. Square steel tube (mm )Rectangular steel tube (mm)ODWTODWTODWTODWT15*150.6--1.5120*1201.7—5.7520*(25—50 ...