It looks like it came from a dirt or dual purpose bike.
Here's a wrench from one the XR250s I used to own:
Hey, looks like we have a winner. Honda “Eye Wrench”, part number 89225-KF0-000 (
CMSNL link w/photo,
Partzilla link with no photo).
Came with XR-class machines from about ‘83 to ‘04 or so. Unlike your pics tho, neither mine or the CMSNL photo have a deep socket like yours. If you ever get a hankering to unload it, let me know.
A CB550(can't remember the year)had that same,exact wrench in it's tool kit;it looked in the same condition as all the other tools in there and it may have come with the kit from the factory.
I sold the tool kit.
I liked that factory multi-wrench so much that I bought another one from one of my friends in MI. who was a 'parts breaker'/parted-out used bikes. I still have it.
I poked around in some parts fiches and didn’t see a wrench which matches for any of the 550’s *shrug*.
So, just under 1/4"
Yep; ‘zat help at all?
Thanks for the assist on this, y’all.