Adafruit 196 proto screw shield wing shield kit adafruit 196 p the adafruit proto screw shield is one of those brilliantly simple ideas a prototyping board with a screw terminal for each of the arduino pins the shield also has stackable headers so you can plug another shield on top and still have access to all the signals p p supplied as a bare board plus 1 x green and 1 x red led 1 x reset button a set of stacking female headers and enough 3 5mm screw terminal blocks for 36 conne