... pole. Transport BridgeCharateristics:1. The main body is made from channel steel, H-steel, angle iron, stand pole. 2. In two ... plated after grinding. 4. Use vacuum absorb tighten and loosen system, can be adjusted, the fan flow also can be adjusted ... & OriginMaterialMain Body of Transport bridgeTangshan 20# channel steel, 20# H-steel, 14# H-steel, 12# channel steel, 50 angle iron, 40 angle iron ...