If you wish to purchase a Sherline CNC mill, but you want to use your own computer and software instead of Sherline's computer with pre-loaded LinuxCNC software, this package makes it easier. Here's what you do: 1. Order the CNC-ready mill and lathe of your choice. 2. Order this kit (4-axis driver box and connecting cables plus power supply and 5 High-Torque Stepper Motors). 3. Supply your own computer and monitor.