The 22-DE-104 prototyping breadboard fills the entire surface of a standard PC/104 form-factor with a grid of 0.070" pads with 0.038" plated-through holes on 0.100" centers, except for the area reserved for mounting-holes and connectors. There is a Vcc plane on the component side of the board, and a Ground plane on the solder side. The circuit board measures 3.550" x 3.775".