[Optional Accessories] What screw size is used when attaching the discharge resistance cable 05-00054B?

[Optional Accessories] What screw size is used when attaching the discharge resistance cable 05-00054B?

M4 size (with washer).
2 pieces are required for the connection between the horizontal coupling plane and ground plane, and 2 pieces are required for the connection between the vertical coupling plane and ground plane. *4 pieces are included as standard at the time of shipment.