4 terminals, 22mm mounting hole, 1NO+1NC contact type, red mushroom emergency stop latching push button switch with yellow cap. Used widely to control the electromagnetic , contactor, relay and other automatic control electric circuits. Package Contents: 20 x Push Button Switch Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.