It is a board-to-board interconnect on a standard 0.100" (2.54mm) pitch, with a matching row spacing of 0.100" (2.54mm).
Rated 5 A per contact, the 79425-430HLF handles moderate signal and low-power duty across all 30 circuits. It is not specified for high-mating-cycle or corrosive environments, but the thick 100.0 µin plating gives better wear-through resistance than a standard flash tin.
The header uses phosphor bronze contacts, a common choice for spring properties and conductivity in stamped pins. The overall contact length of 0.410" (10.41mm) breaks down to a 0.190" (4.83mm) mating length and a 0.120" (3.05mm) solder post — the post length is sized for standard 0.062" (1.6mm) PCBs.