u channel shape: C channel standard: JIS, DIN, ASTM, Chinese GB materials: Q235, SS400, ST37-2, S235JR size: 50-250mm,etc u channel shape: C channelstandard: JIS, DIN, ASTM, Chinese GBmaterials: Q235, SS400, ST37-2, S235JRsize: 50-250mm application: construction current resources:Chinese GB Q23510#/6m-9m16a#/9m20a#/12m32a#/12m20a#