This breakout board connects to second generation Duet boards ( Duet Wifi or Duet Ethernet) expansion header and is specifically designed for external drivers that take differential signals. It breaks out each of the 5 Expansion header stepper channels as follows:
It also breaks out heater 6 and 7 signals to 5V. The documentation is here.
It comes with Molex KK compatible connectors and crimps, along with the 50way IDC cable to connect to the Duet expansion header.
Note it is not compatible with older first generation versions of the Duet (0.6, 0.8.5).