It's the kind of part you spec when you need a modular, snap-to-length pin strip for board-to-board stacking — the breakaway construction means you can trim the pin count down from 20 if your layout only needs, say, 16 positions, though this one ships fully loaded with all 20.
Peer Alternative: 1376779-2
If you're cross-shopping, the closest functional peer is TE's 1376779-2. It's the same 20-position, 2.00 mm pitch, dual-row unshrouded header, same through-hole termination and UL94 V-0 housing. The differences: 1376779-2 is rated 3 A and 250 VAC (vs 2 A and 125 VAC/DC), but its gold mating finish is thinner at 8.00 µinch (0.203 µm) — a trade-off between current capacity and mating cycle life. For a high-vibration or frequent-mate application, the 15 µinch gold on 1-2842127-0 gives you more margin before the contact wears through.