What's It?

[Sasquatch-1]

313376

It appears to be some kind of screwdriver but is marked CAL 20.

I do not know what it is.

[flemc1]

Well sir ,
google says it a Beretta 20 ga. choke wrench .

[fordwannabe]

Couldn't have told you it was for a Beretta but yup definitely a choke wrench.

[metricmonkeywrench]

Got a similar one for a Stoeger choke somewhere about as well

[atr]

I've never heard of a choke wrench....what are they used for?

[45_Colt]

I've never heard of a choke wrench....what are they used for?

To change the choke in the end of a shotgun barrel. Some shotguns have the choke as part of the barrel. IOW, it can't easily be changed for another.

Other shotguns have threaded screw-in chokes. Having two small slots on the end for the above wrench to fit into to turn the choke (for removal or install).

45_Colt

[flemc1]

Try google lens , the same one is listed and Yes for Baretta .