I don't know but I bought a 3/8" reducer bushing instead for my routers. You can get them in a variety of sizes. I have 1/4 x 1/8 and 1/4, 6mm, 8mm, and 3/8 x 1/2.
Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.