Features: 1. The latest CH340G CNC Shielding Expansion Card version 3.0. 2. Adopt board MCU, USB interface. With 30cm USB cable. 3. With 4 DRV8825 stepper motor drivers 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. Specifications: for CNC guarding board: The latest CH340G 3.0 version 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 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 torsion: 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 three 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 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 * 30cm USB cable for board 3 * shock absorber Note : Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. .