This is Sparkfun part COM-09190.
This is a standard 12mm square momentary button. What we really like is the large button head and good tactile feel (it 'clicks' really well). This button is great for user input on a PCB or a good, big reset button on a breadboard. Breadboard friendly!
This is a brand-new, old-stock item that has been in storage. Full warranty and technical support. Click here to learn more.