50x50mm hollow section/SHS/RHS/hollow pipe Standard: BS,ASTM,GB,DIN Grade: ... # etc. Mill price Good service 50x50mm hollow section/SHS/RHS/hollow pipe1)Material: Q195/Q215/Q235,Q345,20#,45# ... Our factory's advantage is to do processing to the pipes,like making threads,swaging,punch a hole ,flat squazzing ... processing to the Square Pipe.50x50mm hollow section/SHS/RHS/hollow pipe 50x50mm hollow section/SHS ...