The Adafruit Pi Stemma is a small, easily removable breakout that easily adds a 4-pin JST SH pin (Stemma QT or Qwiic) connector to your Raspberry Pi. The 2x3 socket design allows you to plug securely into the Pi's I2C bus with no soldering required, Works great if you want to add a QT connector for quick I2C sensor and devices integration without any header-fiddling.