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720mm - 377mm × 12mm × 1500mm LSAW Concentric Reducer Conical Steel Pipe for Structural Transition Section, Find Details and Price about Concentric Reducer Conical Steel Pipe from 720mm - 377mm × 12mm × 1500mm LSAW Concentric Reducer Conical Steel Pipe for Structural Transition Section - Qingdao Sangao Metal Structure Co., Ltd.