Features: 1.The latest CH340G CNC Shielding Expansion Card version 3.0 for Arduino. 2.Adopt board for Kuman , MCU for ATmega328, USB interface for ATmega16U2. With 0.3 m USB cable. 3.With 4 stepper motor drivers for DRV8825 with heat sink. 4.3 pieces of stepper motor for NEMA?17, 84oz (59 cowhide) 47 mm body 1.8 degree with mounting bracket kit. 3D printer CNC robot with 3 mounting brackets and 12 M3 screws. 5.3 mechanical limit switches for Endstop for 3D printer for RAMst 1.4 with 3?pin 70 cm cable. specification: 1. The latest CH340G CNC Shielding Expansion Card version 3.0 for Arduino. 2. Adopt board for Kuman , MCU for ATmega328, USB interface for ATmega16U2. With 0.3 m USB cable. 3. With 4 stepper motor drivers for DRV8825 with heat sink. 4. 3 pieces of stepper motor for NEMA-17, 84oz (59 cowhide) 47 mm body 1.8 degree with mounting bracket kit. 3D printer CNC robot with 3 mounting brackets and 12 M3 screws. 5. 3 mechanical limit switches for Endstop for 3D printer for RAMst 1.4 with 3-pin 70 cm cable. s: for CNC guarding board: The latest CH340G Shield 3.0 version for Compatible with: for GRBL 0.9 For the 4 axes (X, Y, Z, A-Can copy X, Y, Z or use the custom firmware with pins D12 and D13 to make the complete 4th axis) 2 * end stops per axis (6 in total) Coolant release Compatible: for A4988 or DRV8825 stepper drive Power: 12-36V DC Compatible: for Kuman , for For DRV8825 Stepper Motor Driver: 2.5 A Maximum Current / Phase, Suitable for Software and Hardware For Nema 17 stepper motor: Model: 17HD48002H-22B Step angle: 1.8 Holding torque: 59Ncm (84 oz.in) Rated current / phase: 1.7A Frame size: 41 * 41mm/1.61*1.61in Body length: 47mm/1.85in Shaft diameter: 5mm/0.2in Shaft length: 22mm/0.87in Mechanical limit stop connection instructions: Red line connected to VCC (slope +) Black line connected to GND (slope - ) Green line connects SIGNAL (slope in s) Tips: Under normal circumstances, the system must have at least 3 machines Switch to the configuration you want. Advantages: easy to install, the most common style Cable length: 70 cm/27.56in Package List: 1 * CNC guarding board 1 * board for Kuman 4 * Stepper motor driver for DRV8825 4 * Aluminum cooler with 3meters tape 3 * 1.7 A stepper motor for Nema 17 3 * Stepper motor mount for Nema 17 12 * M3 screw, bracket for stepper motor 3 * mechanical switch end 3 * 3pin 70 cm cable 1 * 0.3 m USB cable for board 4 * Coupling