Product Name:Push Button Switch Operation Type: Momentary Light Voltage:no light include Contact Type:NO Material:Plastic & Metal Package Content:20 x Push button Switch Mounting Hole Dia.:10mm / 0.3" Red Button Diameter:7.8mm/0.3" Terminals Quantity: 2 Rated voltage:250V/0.5A Total Size: 26x12.6mm 1.Button momentary when pressed, automatic reset 2.Used widely to control the electromagnetic , contactor, relay and other automatic control electric circuits. 3.100% brand new and , good replacement for your old or broken ones.