What is this?

[apexit1]

My father in law passed and left me his tools. I’m going through them and listing what I don’t need and came across this. No idea what it is, case says set 883 on it, no brand visible. Anyone know what this is?

One side is square the other looks like it locks into something almost like a spline

 

[Kirk]

Are they internal pipe wrenches ?

 

[The Cobbler]

I'm thinking that too. what are the dimensions ?

 

[kaymccampbell]

****** and thread extractors for pipe. I've got a set in a drawer somewhere.

 

[Jbullfrog]

That would be a set of Ridgid internal pipe extractors. You drive them into a ****** and then turn it in or out of the fitting. https://www.amazon.com/dp/B001SXNDYS/?tag=atomicindus08-20

 

[apexit1]

That would be a set of Ridgid internal pipe extractors. You drive them into a ****** and then turn it in or out of the fitting. https://www.amazon.com/dp/B001SXNDYS/?tag=atomicindus08-20

We got a winner. Thank you everyone