The locking ramp holds the pair mated against moderate vibration — think appliance control boards, telecom line cards, or point-of-sale internal harnesses where you want a positive latch without a secondary clip.
The IDC termination presses the 28 AWG wire into the slot without cutting the conductor; the closed end forces the wire fully home. No special tooling beyond the hand-press or bench fixture — the IDC slot geometry does the work.
