This Screw Shield is perfect for your wire extensive Arduino projects. It provides an extension to all the pins on your Arduino out to a 3.5mm pitch screw terminal which can secure your connections quite impressively. If fits with the UNO, MEGA 2560, and similar form factors. Also, it provides 5V and GND rails, a reset button, and built-in LED indicator. In case you need a breadboard with this shield, this breadboard can fit on top of it.