What this Metrimate plug housing is for
The locking ramp on the plug body clicks into the matching receptacle and stays put; you hear the latch seat, which is the field check that the pair won't back out.
The note on the line says it: contacts are not included. This is a housing only — you order the 207015-1 shell and then separately source the female crimp terminals that go into it.
Mating and termination fit
This is a free-hanging (in-line) plug, so it mates with a panel-mount or in-line receptacle from the same Metrimate series.
Sourcing this housing
The 207015-1 is listed as Active on the lifecycle record, so it's still in the TE catalog. The black thermoplastic housing ships in bulk packaging.