Stepper Motor Controller, 2 Axis Application, 64 Steps Per Axis, 24 VDC, For Use With Stepper Motor Drivers 5PFF4, 5PFF5, 5PFF6, 5PFF7, Max Output Pulse Frequency 4 Mpps, Height 3-9/16 In, Width 1-3/8 In, Depth 2-3/8 In, 2-Hole Mounting, Mounting Pattern 3.74 In on Center, Requires Stepper Motor Driver 5PFF4, 5PFF5, 5PFF6 or 5PFF7 and Ribbon Cable 5PFG0 or 5PFG1