It uses a 0.100" (2.54 mm) square grid — the same pitch on both rows and between rows — so it lands on a standard 0.100" x 0.100" PCB footprint. Tin-plated phosphor bronze contacts carry 5 A per circuit at 110 V, with a 100.0 µin (2.54 µm) tin finish on the mating surface. The through-hole solder tails are 0.120" (3.05 mm) long, and the overall contact length of 1.040" (26.42 mm) gives a generous 0.820" (20.83 mm) mating section for a secure connection.
The 12 positions loaded all give you a full 2x6 matrix; no skipped or dummy pins. The 110 V rating is conservative for a 0.100" pitch in dry indoor environments — creepage distance between adjacent pins handles 110 V comfortably.