... surface:300-400g/sm4>Size: From 13*13mm to 500*500mm 5>Wall Thickness:1mm-6mm ,as ... specifications models square steel pipe,and high quality services to our customers . Since we accomplish all the ... process from brass melting ,extrusion ,machinery to finish our factory ,the quality of products is ... domestic market ,so please feel free to contact us if you want to make an inquiry .I will reply ...