It carries 16 loaded positions — one position is unpopulated, which matters when you're counting circuits against the mating half. The friction lock provides retention against light vibration without a secondary latch.
Through-hole termination with a solder post length of 0.140" (3.56mm) — the board hole pattern and solder fillet height need to accommodate this. Insulation height is 0.305" (7.75mm) above the board surface — factor this into the z-height budget if the header sits near an enclosure lid or a second board.