It's a free-hanging (in-line) housing designed to terminate a flat flex cable or a PCB edge directly — no mating header required.
The Critical Detail: Contacts Are Not Included
This is the most common sourcing trap on this part: a buyer adds the housing to the BOM but forgets the contacts, then hits a line-down situation.
Fit and Key Dimensions
The card thickness spec is 0.059" (1.50 mm) — a thicker board will not insert, and a thinner board may lack retention. The free-hanging mounting type means this housing is not board-locked; it lives in the wire harness and mates to the card edge by hand, with the locking latch taking the strain.