On a bicycle forum somebody asked now to cut spoke threads, which are
#2-56. A quick Google search turns up this die on Amazon, sold by
Smallparts. The die manufacturer is not given-
http://www.amazon.com/Adjustable-Pro.../dp/B000FMYH8Y

Note that the description says {"#2-56 Round Adjustable Three Pronged
Carbon Steel Threading Die, 7/32"" Die Diameter"}

what is that (7/32" die diameter) business in there??? Is that an error
in the description, or is there dies with that small of an OD? A #2
screw is about .086", and 7/32" is a lot larger than that.... but not a
whole lot larger, I am thinking. ?:|

I know you can get tiny die sizes in 3/4" / 19mm, but I am wondering if
this dinky size really exists.

The smallest round die stock that Smallparts sells is a Union
Butterfield that is designated as a "D2" size.... but I can't find
anyplace that tells what the "D" sizes of these stocks are?