[Cherryville Chuck]

Hi Bob and welcome. I couldn't find it in a straight bit but I found it in a spiral. Other makes may have it. https://www.whitesiderouterbits.com/collections/up-cut-spirals/products/ru3100 It can be hard to find collets that size but you can get bushings that fit into a standard 1/2" collet. Bushing Adapters - Lee Valley Tools As you see in the Lee Valley link, the 5/16 bushing is very close to the same size as an 8 mm shank router bit so an 8 mm bit is also an option.

 

[Cherryville Chuck]

Bob I'm suspecting that you may not be in North America. This is why we need members to fill out their personal profile because not being in NA makes a big difference in what we suggest to you. I'm guessing that that may be an 8mm collet which is common on European routers. I heard talk at one time that 1/4" shank bits were going to be gradually phased out here but it hasn't happened yet.

 

[Cherryville Chuck]

Actually, I live in Eastern North Carolina... Thanks...

What router and model did you purchase then out of curiosity?

 

[Cherryville Chuck]

We do, I just don’t often bother looking at them.

I once thought the same thing about 1/2 to 12mm but both Elaire and Musclechuck make them and both companies produce high quality products, so it can be done.