From Samtec, these ESQ series are elevated stackthrough or 'self nesting' PC/104 sockets with a 2.54mm pitch that offer an easy and efficient way to accommodate multi-way board to board connections. These ESQ series PC/104 double row sockets have black glass filled polyester housings, gold plated contacts, square tails and accept 0.64mm square pins for board to board applications and are available with a low or standard insertion force and with various lead styles (please refer to datasheet for details)
For mating connectors see:
DW series PCB headers (stock number 277-9720 typically)
EW series PCB headers (stock number 277-9742 typically)
TSM series PCB headers (stock number 765-6423 typically)
TSW series PCB headers (stock number 767-0820 typically)

2.54mm Board to Board and Wire to Board - Samtec