Strong rectangular frame fixed by screws, an inset hole every25 cm to fix the slotting auger, guard board, bunches of cables and circuit diagram sidekicks, etc.

• 坚固的用螺丝固定的长方框，每隔25毫米有一个嵌孔，用来固定槽沟、板、缆束及线路图插袋等。