Here an adjustable spark gap. We don't know what it was for. Maybe you do?
The knob on the bottom controls the gap size.
That's all we know about it. This item is sold as is.

How To Order:

Purchasing our bargain bin packs is easy.
Just send us an email indicating the bargain pack(s) you want (use the [item] number).
We will let you know the total price including shipping and handling.
Please see the Shipping and Handling link for ordering, payment and shipping details.

Contact MDB Ventures
sales@mdbventures.com
or
sales@fourwater.com