Miniature push button switch, normally Closed, Momentary open while you push the button. Easily mounts on metal or plastic boards with up to 3 mm (or 1/8 inch) in thickness, in any 7-8 mm mounting hole. Has a black button. Two contact pins may be used for soldering or temporary connection to small clips. Each switch comes with one locking washer and one nut. Orders of 10 and more receive bulk quantity discount and wholesale discount.