Optional panel mounting frame offers an easy solution for the installation of control switchboards in Type 50 and 55 outside cases (MCM #22-10446 and 22-22-15299). The panel frame mounts to the support rods on the inner wall of the case via predrilled holes. With the help of only 4 pcs. stainless steel screws an easy, stable and exact manufacture of your individual outdoor.cases is guaranteed. After the panel frame is installed, your electronic switchboard and control panels, adapted to the size of the outdoor.case, can be put on the frame and fastened easily with screws.