Holley carburetor main jet sizing question

I'm curious about an apparent inconsistency in the size stamped onto the
Holley main jets that came out of a Holley two-barrel 6280 feedback carb
designed for the Chrysler 3.9L engine that went into the 1987 Dakota V6.

The jet is stamped "175", but the hole appears slightly less than 1 mm
in diameter so the 175 cannot be in reference to the hole size, which
would normally indicate a 1.75 mm opening.

Could this be in reference to flow rate that was used by the 124-XXX
series of Holley main jets? I couldn't find anything that referred to a
Holley 124-175 main jet anywhere on the web and Holley wants an
incredible amount of info before they will accept an email inquiry. The
following site has a table of equivalence between the 124-XXX jets that
are flow rated and the older 22R-103-XXX that are size rated.
http://www.mazdatruckin.com/B2200/5200.html The chart is a little past
halfway down and is titled: "Main Jet Conversions".

A quote from the article reads,

"Note that not all available jets may be listed as they might not flow
an equivalent volume between old and new jets."

A flow rate of 175 cc per minute seems low but these main jets were
augmented by the jet that was controlled by the mixture control
solenoid, so maybe the 175 *does* refer to flow rate.

Anyone know for sure? Holley website was no help. The Holley Tech
Service Request Form was like a final exam and I guess was put up to
deter people like me looking for info on arcane, abandoned technology.

Jack