This is a vintage American GILBERT lamp cord switch (inline switch). GILBERT was a wiring device manufacturer based in New York. It's a rotary switch. Functionality has been confirmed with power applied. It's a small and simple design switch. How about using it as a part for making lighting fixtures? Size: W31.5mm x D15.5mm x H16.5mm Switch diameter: 21mm Country of origin: USA Material: Plastic Please understand that this is an old item, so we appreciate your understanding of vintage items.