High-quality hot-dip galvanized steel pipes are used. The top of the vertical pipe is perfectly punched into a pointed shape by a heavy-duty punching machine. The crossbar is punched with holes matching the vertical rods. The vertical rods and crossbars are installed through interspersed combination, and are connected with exquisite small bayonets to make the vertical rods and crossbars firmly combined. Alternatively, the crossbars and vertical rods are directly welded to form a perfect fence, which is highly artistic and practical.