The tin-on-tin contact system (100.0 µin mating finish) is reliable for a few hundred mating cycles in controlled environments — think test fixtures, internal board bridges, or backplane mezzanines that don't see repeated field service.
Pitch, footprint, and routing
The 0.100" pitch and 0.100" row spacing match the 2.54 mm grid.
Plating and environment
The 100.0 µin tin mating finish is thick enough to resist fretting corrosion in moderate-vibration environments, but tin-on-tin contacts do wear faster than gold under repeated mating. For a board-to-board header that mates once during assembly and stays put, this is a cost-effective choice.