These 90 degree 4 pin connectors are "perfect" for connecting an M5 Stack device (Core, Stick, Atom) using its Grove connector to a SparkFun 60 LED ring. The StickC plus has an RTC plus WiFi so making an LED Ring clock is so simple and the tech is fully encapsulated, fast and efficient. These connectors are used by snipping 1/2 of the pin length off then soldering to the back of the ring... They worked perfectly.