It may fit Rem chokes, but I think that the wrench is actually a Beretta/Benelli choke/thread chaser. I got couple of them with the couple of the Berettas that I bought. It did come in use when I use to just drop the extended choke tubes in to the barrel. I must have bent the starting thread in the barrel. The chaser straighten the thread up. Now I gently put the new tubes in.
Assume nothing, be very careful using the thread chaser part even in a Beretta or Benelli for the first time.