This is a serious piece of industrial equipment: a standard 22mm emergency stop push button switch.
You know the type – that big, red, mushroom-shaped button you press in an emergency to instantly cut power and lock the system off.

This one has a latching action (push to stop and lock, then twist clockwise to reset).

It features a DPST (Double Pole Single Throw) contact configuration with 1 Normally Open (NO) and 1 Normally Closed (NC) contact.

It's rated for up to DC 220V/4.5A and is designed for control circuits in machinery, CNC equipment, conveyor belts, etc.

The body is made from flame-retardant PC material with a waterproof cover, making it suitable for tougher environments.
It requires a 22mm (about 0.87-inch) panel cutout for mounting.
Important note: To reset it, you must twist it to the right; twisting left will loosen the knob.
Always consult a qualified electrician for installation in any control system.