Plated through hole solder breadboard. Plated through holes on 1.27mm matrix. Hole pitch of 1.27mm center-to-center. Pads are 1.0mm diameter (0.039") in size. Holes are 0.64mm (0.025") in diameter. Space between pads is 0.27mm (0.011"). Dimensions: 2.0" x 2.0" x 0.063" PCB construction: FR-4 UL94V-0. PCB operating temperature range: -40C to +130C. PCB reflow maximum temperature: +260C.