This is a pack which includes:
1 pcs 2×18 pin lengthen female header
1 pcs 6-pin lengthen female header
5 pcs 8-pin lengthen female headers
They all have 2.54mm spacing between pins.
These headers are made to work with the Arduino MEGA 1280/2560 Main Board. They are the perfect height for clearing the USB-B connector and great for stacking multiple shields. Their long legs make it enough to connect a shield to an Arduino MEGA Main Board. These are the same headers we use in our tutorials and with our own shields