What is this I found with some nickels?

I found this with a lot of Liberty Nickels
4.25 g
19.99 mm diameter
1.79 mm thickness

 

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That "ear" between 7:00 and 8:00 on the first photo looks like the attachment point for an electrical box punch-out. Have you checked it with a magnet?

At those dimensions and weight, it might be a nickel that's had a lot of its actual nickel metal eaten away by acid. But my first guess is that it never was a coin of any sort.

 

I’m sure I have a couple in the bottom of my toolbox

 

Not magnetic. I thought punch out too. I'm leaning toward the acid eating a nickel possibility.

 

I vote punch out as well. I have one that for a long time thought it might be a cent blank, but it's only slightly larger than a Fiji 1c. Yours also appears to be rounded on one side and more squared off on the other like mine, but it's hard to tell from the images.

 

I have something close, definitely steel magnetic, ever so slightly larger than a nickel and a little heavier.
In much better condition As found in some random world coins... possibly a blank of a world coin.
Nickel for reference.

 

There are aluminum electrical boxes but if aluminum it should weigh about 1.52 grams.

It could be non-magnetic SS as there are SS electrical boxes.