... is made from channel steel, H-steel, angle iron, stand pole. Transport BridgeCharateristics:1. The main body is made from channel ... steel, H-steel, angle iron, stand pole. 2. In two sides have safe guardrail, ladder, high-strong ... -leading roll, tighten roll, and paper-leading roll are all chrome plated after grinding. 4. Use vacuum absorb tighten and loosen system ...