Its a remix of the PTFE Mount for the Sprite Extruder, that includes a Toolhead sensor.
For connection it uses a PC4-M10 Fitting and 2 2x20mm self tapping screws for the sensor.
You need a OMRON D2-F Switch without the Lever and a 5mm ball.
The author remixed this model.
added a mount for a toolhead / gate sensor.