Often referred to as a D bit grinder.

Blondihacks has one: https://www.youtube.com/watch?v=VLRg24LrcJw&pp=ygUMRGJpdCBncmluZGVy

as does Stefan Gotteswinter: https://www.youtube.com/watch?v=-qHchpQeuho&pp=ygUMRGJpdCBncmluZGVy

Rod

I have one of those. Mine has dual dials (metric/inch) and I;ve never seen another that does.

I use mine primarily for grinding small carbide lathe tools from 6mm carbide endmills.

These things can do an awful lot, you just need the correct accessories.  This is true of all the tool and cutter grinders (Clarkson, KO Lee, etc). You’ve got the universal head so that’s a good start.  With that, you can sharpen the teeth of end mills, drills and grind D-Bits and a fair bit else besides.

This one is the original article (as opposed to the Chinese clones), so it should be pretty precise.

One thing you might consider, were you to buy it, is taking a look on AliExpress.

The mill flute sharpening attachment and lathe tool grinding attachment for the Chinese U2/U3 clones are available pretty cheap and I think might be out-of-the-box compatible, or if not out-of-the-box compatible, compatible with some work.

I managed to snag a Chinese clone version for £100, that had been sitting unused for a fair old time, and I need to clean it up and get it working.  I’ll use it mainly for sharpening ends mill teeth, and when I get round to buying the mill flute sharpening attachment, mill flutes, too. Maybe I’ll knock up some D-Bits or pyramid cutters at some point.