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Female headers are very common parts found on a wide variety of electronic circuits and modules. They are mostly used to connect some external circuitry to the main circuit, or to connect sensors to micro controllers such as an Arduino Uno. These specific female header pins have a pitch of 2.54mm, which is the most common and standard headers used in the industry of electronics. The nice thing about these female headers are that they are long and push far through the holes, which means that the one side of the board can be used as male headers while the other side is used as female headers.