How to make billboard bracket

A plate is fixed in the middle of the flagpole at the upper and lower ends, so that the flagpoles at the upper and lower ends and the plate fixed in the middle form an advertising board, connected A fixture for a lamppost is set on the advertising board. The clamp is welded to the plate and has a ring-shaped structure with a clamping screw at the end. The advertising board formed by the flagpoles at the upper and lower ends and the plate group fixed in the middle is divided into two layouts on the left and right. Two sets of clamps are set on the flagpoles at the upper and lower ends.