2x10 Pin male header, 2.54mm, Gold plated. It has double plastic spacers with 5.75mm distance between them. This connector has been designed to be soldered onto the target board, and plugged into a female header on a second board. Using a standard female header that is 8.5mm high, this will give a spacing of 14.25mm between the two boards. Other common height for female pin headers are 5 and 7mm.
1 x Connector as described above