Contact mounts inside the C90 and provides 2 contacts for cell voltage. Used in C-90 C-90A C-90B. Red fiberglass board 1/8" thick. Overall size measures 6¾ x 3½ inch.High voltage wire must be used for connecting this board to the power supply. If replacing the red and black high voltage wire, use 4074EMN and 4074EMP.NOT included is the stainless lever for grounding the cell 616-215-00.