Gunsmithing Impact action wrench size

[Smokin7s]

What size socket does the impact action wrench use, haven’t got it yet but would like to have a spare for it when it gets here so I’m not always robbing one.

 

[StrayDog]

21mm

 

[Smokin7s]

21mm

That’s what I assumed but wanted to be sure I’ll leave this post here in case anybody else wonders