What is the structure of the "rectangular bronze mirror with dragon pattern" in the tomb of the King of Qi in the Eastern Han Dynasty?

The bronze treasures of the Han Dynasty and the "rectangular bronze mirror with dragon pattern" found in the ancient tomb pit in Zibo, Shandong Province, are1.15m long, 0.57m wide and weigh 56.5kg.. There are five ring-shaped chord buttons on the back, and two buttons are cast on two short sides. Each ring buckle is decorated with persimmon-shaped patterns around it. The back is decorated with dragon's tangled pattern, which curls freely.

This large bronze mirror is probably supported by columns and seats. When it is fixed by columns and seats, buttons on the back and sides of the mirror may be used.