8mm watchmaker collet dimensions

[JWWalthall]

I am looking for the dimensions for the 8mm collets that are used in watchmakers lathes or the Sherline lathe. I have a project that I need to see if this collet will work. any information on where I can find this information would be great.

Thanks

Jim W

[keithwwalker]

Sherline's site only states:
Sherline WW collets that have a shank diameter of .312-.313". Other manufacturers make collets that vary in size up to .314-.315"

The larger size is referred to as an 8mm collet....