This is a stacking header for Raspberry Pi A+/B+/Pi 2/Pi 3 - 2x20-pin GPIO header with 2 Spacers. 2 stack multiple plates, breakouts etc onto your Raspberry Pi with this 2x20 female header. The female header part has extra spaces to make it 18mm tall: when placed on your Pi, a PCB will clear the ethernet and USB jacks. Plastic height is 8.6mm, pin length 4.4mm. It's ideal for basic Pi plate design