100 positions, 2.54 mm pitch — board-edge density play
The unshrouded profile leaves the pins exposed — no shroud to guide the mating half, so alignment is on the board layout and the mating receptacle's own polarization.
The post finish is tin (118.1µin), which is standard for solder joints — the tin wets well with standard lead-free wave or hand-solder processes.
Through-hole right-angle — layout and assembly
Through-hole termination with a 0.126" (3.20mm) post length — that's the tail below the board surface. Right-angle pins mean the header body sits on the board edge, with the pin tips pointing away from the board. The insulation height is 0.219" (5.56mm) above the board, so the mating receptacle's body will sit roughly at that height off the board surface.