Features: 3D printer CNC kit, professional CNC-module kit for GRBL CNC Shield- Kit ；4-layer PCB- board for better heat dissipation With R3 Board + RAMPS1.4 Mechanical Switch- Endstop + DRV8825 Stepper Motor Driver + Nema 17 Stepper Motor Boost your diy projects with this high-quality CNC kit made from durable ABS material, perfect for hobbyists and professionals alike. 4pcs DRV8825 stepper motor driver with heat sink, upgraded from A4988, high performance. The precision- of this CNC kit is unmatched-, providing accuracy and consistency in every cut or carve, making it a reliable tool for all your crafting needs. Specifications: Item: Latest CNC Shield- Kit Compatible with： A4988 or DRV8825 stepper driver Working Voltage: DC12-36V Max-. Working Current: 2.5A RAMPS1.4 Mechanical Switch- Endstop: Red: VCC (ramps +) Black: GND- (ramps -) Green: SIGNAL (ramps-s) DRV8825 Stepper Motor Driver: Upgraded from A4988 Maximum Current: 2.5A Suitable for driving stepper motors- up to 8.2V~45V, 2.5A Nema 17 Stepper Motor: Rated- Current/phase: 1.7A Package Includes: 1 x CNC- Shield-V3 Board 1 x R3 MEGA328P CH340G with USB Cable 4 x DRV8825 Stepper Motor Driver with Heat Sink 3 x RAMPS 1.4 Mechanical Switch- Endstop 3 x 4pin Cable (70cm) 3 x Nema 17 Stepper Motor note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.