... : 0.6mm-55mm Length: 2-12mC. Square and Rectangular Steel Tube 1.Standard: BS1387,ASTM A53, ... 1.Surface treatment: oiled, black-painted, 3PE coating and hot dipped galvanized coating. 2. End: I. ... line,1 hot dipped galvanized coating line and 1 processing from round pipe to rectangular&square ... you will be satisfied with best price, good quality and service, hope to set long business relationship with ...