ADAFRUIT INDUSTRIES 85 SHIELD STACKING HEADERS ARDUINO (R3 COMPATIBLE) (1 piece)

What are they for? Stacking. You put the headers on top of your Arduino and then you can add shields like our Protoshield or our Motor Shield or our Proto-Screwshield (pictured above) to get your Arduino doing all the cool things you want it to. Our set includes 1x 10-pin header, 2x 8-pin headers, 2x 6-pin headers, and one 2x3 header. The legs are all 10.5mm long, so after PCB thickness (1.7mm) you have a height of 8.8mm - just enough to clear the Arduino's USB-B connector. They're also fully compatible with shields designed for Arduino R3 and the Leonardo. For shields that don't use the 10-pin header or 2x3 header, use the 6 or 8 pin ones.