It's a free-hanging (in-line) crimp housing — a shell that holds the female socket contacts, not a finished connector. The 0.098" (2.50 mm) pitch and 0.148" (3.75 mm) row spacing are the standard D-2100 grid, and the latch lock on the sides gives a positive hold when mated with the matching plug housing.
This is a bare housing. Without those terminals, this is just an empty shell.
Mating Connector and Harness Fit
For a wire-to-wire or wire-to-board harness, you'd pair this receptacle with the appropriate D-2100 plug housing and crimp the matching terminals onto your wire ends. The 2-row, 6-position layout means three circuits per row.