Metal Push Button Relay Switch Momentary Reset Button 2 Wire (12mm Diameter) This metal momentary push button relay switch is ready to use. Easy to install screw on clamp to make fitting very easy. Pre-attached ready to solder wires make connection and use very easy. Brand new and durable. Mechanical life - 100,000 cycles Fits opening holes 12mm in diameter. Wires are 10.5 inches long. 2 Pin, 2 Wire Connection Momentary Type: One Push Activation or Reset Easy to install, screw clamp type terminals to make fitting very easy.