Xi'an Linkun Materials Co.,Ltd is one of the leading China astm a500 square steel tube manufacturers and suppliers,Website:http://www.lksteelpipe.com, if you want to buy or import best high-quality astm a500 square steel tube, a500 welded steel tube, a500 gr a carbon steel tube, a500 grb carbon steel tube, a500 grc carbon steel tube, a500 grdcarbon steel tube professional company, factory, seller, and exporter, or if you are checking astm a500 square steel tube brands, please feel free to contact us. Size: Round section:O.D(1/2in-18in )21.3-457.2mm T.K:2.77-12.7mm Shape section: O.D 25*25mm-250*250mm T.K:2.41-12.7mm