These are simple through-hole RJ45 sockets with PCB mounting posts.

These 8-pin connectors are commonly used in conjunction with Cat5, Cat5e, and Cat6 Ethernet cables. Because Ethernet cable is so ubiquitous, these are awesome for projects where you need to string a lot of modules together over a distance.

SparkFun used these, along with the breakout boards, in the Sound Squid demo!

Note: The price listed is for one jack.

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