Material:Q345A,Q345B,20#,45#,Q235 ,SS400 Spécial Pipe:Square and rectangular tube Outer Diameter:15x15mm—1000x1000mm Length:5.8m-12m Thickness:0.6 - 50 mm Section Shape:Square Secondary Or Not:Non-secondary Application:Structure Pipe Certification:CE Surface Treatment: black, oil, Black Oil Surface Or Other Anti-corrosive Treatment 1) - Black,Pre-galvanized 2) - oiled,powder coating 3) - Galvanized as your requirement PS:Pre galvanized Steel pipe: 60-150g/m2;Hot dipped galvanized Steel pipe: 200-400g/m2