This is a 10-pin socket with 2mm pitch that mates with the popular XBee radio from Digi. Use this small part to avoid having to solder your precious radio to a PCB.
You'll need two of these sockets to connect to all 20 pins on the XBee. (they are included in the full telemetry set and on the adaptor boards. This is just for single headers in case you screw up your soldering... :) they are quite something to solder properly.
Please Note: This item is sold singly, not in pairs.