Any one know the brand? There are no markings on it.

I don’t think it is a Nitto or a Cinelli. Sorry, this is about all I can do is help rule out what brand it isn’t.

Not at all sure but sorta looks like a vintage BBB that passed through my shop a few years back.

I bought one a couple years ago. Seemed like they were no longer being made as I had to search all over for a 1 1/8 size. I'll post again if I can find anything.

steerer Extender Headset Adapter For Threaded & Threadless 28.6-25.4mm part number BHP-21 got on ebay from LAXZO

Nashbar has several. Here are a couple of options:

https://www.nashbar.com/dimension-1-quill-to-11-8-threadless-steerer-adaptor-spt-22-blk-22.2-50mm/p322409
​​​​​​https://www.nashbar.com/forte-thread...il-118/p920937

Why there it is. Not just a stem raiser but can also make the steerer longer so I can install a too-short fork in a taller frame.
two sizes:
https://bbbcycling.com/en_en/bhp-21-extender
https://bbbcycling.com/en_en/bhp-20-extender
Branded BBB. (Bike Parts, For Bikers, By Bikers) Primarily a European based company.

Thanks.

I used it to extend the fork in my sons bike. It started to feel like the headset was loose after a year or so and I cant get that to go away. I had to turn it down a little on a lathe to fit the aluminium steer tube but fit solid.

That is the one it was excellent.

Yes, there is no star nut and top cap bolt to preload the bearings so I can see why it could be a bit loose. If you ever tried to get a threadless headset bearing adjustment right without a the top cap bolt, it can be a challenge. I'll be installing it this weekend at the local coop on a kids bike (Specialized Hot Rock hybrid) and well see how it goes. One technique is to use a loop of rope under the crown and over the stem, then tighten ala tourniquet style to put some pressure on the bearings before tightening the stem.

I think that the bolt that tightens the quill wedge is threaded inside the hex key opening so you can preload the headset. The issue I have is that the quill is made one diameter but the inside of head tubes varies considerably.