It uses a 0.100" (2.54 mm) pitch on both rows and contacts, matching the standard breadboard grid. Tin plating on both the mating surface and the post keeps cost down for moderate-cycle applications — the 100.0 µin (2.54 µm) thickness on the mating side gives it decent wear for a few dozen matings, but it's not a high-cycle connector.
Compared to the 64-position 79425-458HLF, the 464HLF carries a 0.120" (3.05 mm) post length against the 458's 0.100" (2.54 mm) post — a difference that matters when the board thickness or the mating receptacle's tail clearance changes. Both are 64-position, dual-row, unshrouded headers with the same 0.100" pitch and tin plating; the post length is the only functional difference a buyer would act on.