It uses a 0.100" (2.54 mm) pitch on both rows and contacts, with a matching row spacing of 0.100" (2.54 mm).
Where it fits
The unshrouded design gives you access to the pins for probing or rework, but offers no polarization or mis-mate protection. The overall contact length of 0.410" (10.41 mm) breaks down into a 0.190" (4.83 mm) mating length and a 0.120" (3.05 mm) solder post, which means the board-to-board stack height is set by the receptacle's mating depth plus the header's own height above the board.