Stable and reliable performance: High quality, ROHS approved material, durable and reliable, shockproof, durable, practical. Can be cleaned and maintained conveniently, excellent quality and long service life Applications: Widely used in cars, trucks, boats, ignition systems, home doorbell and other equipment which uses momentary switch . The metal push button switch is also used for circuit control in electromagnetic starter, contactor, relay and other electrical circuits. (Suitable for 16mm diameter mounting hole) Easy to install and disassemble: Screw clamp type terminals, no need to solder. Waterproof protection, rustproof, can be used in humid or dusty environment Service Guarantee: 100% test before shipping to ensure product safety, stability and durability. We provide 100% perfect customer service, any questions please feel free to contact us Switch Type: Metal Push Button Switch Waterproof Dustproof. Mounting cut hole: 16mm. Type of operation: Momentary switch (self-return). Momentary type: Push & Hold - ON, Release - OFF. Contact: 1 NO (normally open). Connection: 2 screw terminals