TORK TA620 Pushbutton Chrome 24V Max 5/8 IN Diameter
https://nsiindustries.com/product/tork-ta620-non-illuminated-push-button-chrome-5-8-diameter-24vac/
TORK push-buttons provide a simple and reliable way to activate low-voltage bells, buzzers, horns or other audible signals. They are ideal for factory doors, receiving departments, small office buildings, retails stores and private homes.