This stacking header easily provides space between Raspberry Pi and expansion boards. Technical data: - 2-pin rows with 20 pins each = 40 pins. - total height: 23.4 mm - option 1 (socket height / pin height): 8.4 mm / 15.0 mm - option 2 (socket height / pin height): 10.9 mm / 12.5 mm - pin spacing (pitch): 2.54 mm - pin thickness: 0.65 x 0.35 mm - gold plated contacts