Hello all.

The recent thread on taps and dies prompted me to look again at my (yet
unused) all metric set (bought from Screwfix some time ago).
To my surprise, I found the following:
One single short length tap, and one die.
They are marked "NPT 1/8 27". Now, I haven't the slightest idea what they
are for.
I'm not entirely surprised, as this set also contains a screwdriver, centre
punch, thread gauge, and five stud extractors (of the l/h spiral variety).
I'm guessing that they are probably used for "cleaning" damaged threads.

But on what fittings?

Answers will be gratefully received.

Sylvain.