E2K-C25ME1 1-25mm Capacitance Proximity Sensor Switch NPN NO DC 6-36V 300mA AC Voltmeter These float switches are a

These float switches are a device used to sense the level of liquid within a tank

slot machinery

this is the chrome housed spring that returns the quill to the top after you have completed drilling

or what ever your project may be

grinders etc

E2K-C25ME1 1-25mm Capacitance Proximity Sensor Switch NPN NO DC 6-36V 300mA AC Voltmeter These float switches are aIt is a component widely used in automatic control industry for detecting, controlling, and noncontact switching. When proximity switch is close to some target object, it will send out control signal. As it is capacitive type proximity switch, its detecting object target is not limited to only conductor, but also liquid and even powder things, like plastic, water, glass, oil, etc. It's widely used in machine, paper making, light industry for limiting