| 摘要 |
A hollow tube formed into various shapes through a simple pressing method is provided. The hollow tube comprises an uneven part formed by a pressing force applied to the outer surface of the hollow tube; and a space part to prevent the inner surfaces of a concave part from coming in contact with each other. The uneven part is repeatedly formed by connection surfaces which connect the concave parts to convex parts. According to this, the present invention secures high safety and excellent decoration effects for handrails and fences. |
