This is a Latching SPDT ON-ON sub-miniature toggle switch with 3 pins, rated to AC 3A/125V.
The switch has 3 pins allowing singlepole, double throw use. The thread shaft requires a 5mm hole and has enough length to mount it to a panel/enclosure around 2-3mm thick (when using the included nuts/washers).
The switch comes with washers and nuts to mount to your panel/enclosure.
Do not use these switches with mains voltages!