This is an essential tool for iPhone X logic board work. After splitting the iPhone X logic board, a top mainboard can be attached to a known good bottom board in this iSocket, and vice versa to allow for troubleshooting. The iSocket jig will create temporary connections between the two half boards without having to resolder the boards for testing. We tried several similar iPhone X split board jigs, and this one is our favorite for ease of use and robust design. We use this iPhone X iSocket test fixture in many of our iPhone X videos on iPad Rehab YouTube.