Gunner Asch fired this volley in
:

Very true! Ive just never seen a thread file in -28 before. Ive got a
bunch of thread files..both standard and metric..but none in 28 tpi

Snap-on sells a set of three that specifically calls out 28tpi as one of
the 'fit' threads. (9-32tpi, and several metric sizes).

Of course, Snap-on is always pricey, but their tools are always being
dumped by someone in debt and looking for a quick buck.

Lloyd