Furniture,Industry,Structure Building,steel windows and door etc. the good quality and the low ... . product:high frequency round/square/rectangle/oval/other shape welded steel tubesickness:0.45-2.50mmlength:as customer's reqirementpacking:sea ... .our main product*ratio-freqency welded steel tube(common,bright,black annealed,galvanized)*cold rolled steel strip(common,bright,black annealed,galvanized)*hot ...