This stackable 0.1" (2.54mm) female header set is designed to work with Arduino shields and is compatible with Arduinos that have the standard Arduino pin spacing, including the Arduino Uno R3 and Arduino Leonardo, and a subset of the Arduino Mega 2560 R3 pins. The set includes:

• two 1×6 female headers
• two 1×8 female headers
• one 1×10 female header

It has everything necessary for both old- and new-style shields: old- style shields use two 1×6 headers and two 1×8 headers while new-style shields use one 1×6 header, two 1×8 headers, and one 1×10 header.

When assembling a shield, the female side should be on the top side of the PCB with the male ends protruding through the appropriate through-holes and soldered to the underside of the PCB.