What is this?

I think the FB thing is not the complete apparatus. That appears to be the "dog" used to lock in lumber or timber when working on it with some equipment,

You lift on the lever end and the teeth of the rounded end dig in holding the lumber/timber securely in place....My guess.
I stole this and added it to the guesses... might help the person asking
 
IMG_20190307_221427.jpg
 

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