1The for R3 kit is fully equipped, which makes the kit quite practical and convenient for daily use. 2The stepper motor can be connected or soldered in place via a 4pin for Molex connector, and can work at DC1236V. 3The product supports 4axes, in which Xaxes, Yaxes, Zaxes and Aaxes can use pins D12 and D13 to copy X, Y, Z with custom firmware or make a complete 4th axes. 4High quality material can make sure the durability and stability of the product. 5The package includes 4 4401 motors, 4 motor wires, 1 USB cable, 4 A4988 driver, 1 for R3, 1 CNC expansion board, 2 pins, 4 heat sinks and 1 English user manual. Item Type: ForR3Kit Compatible with GRBL 0.8c 4-Axex Support 4 x 4401 Motor 4 x Motor Wire 1 x USB Cable 4 x A4988 Driver 1 x ForR3 1 x CNC Expansion Board 2 x Pin 4 x Heat Sink 1 x English User Manual Currently only the Pololu DRV8825 driver can withstand voltages up to 36V, so please consider the operating voltage when supplying power to the development board.