kuman CNC Shield Expansion Board V3.0 +UNO R3 Board + A4988 Stepper Motor Driver with Heatsink for Arduino Kits K75 (CNC Shield+UNO R3+Stepper Motor) LatestCNCShieldVersion3.0forArduino Arduino UNO R3 Board, MCU: ATmega328, USB interface: ATmega16U2 PWM Spindle and direction pins. 4-Axis support. Runs on 12-36V DC 2 x End stops for each axis (6 in total) 4pcs A4988 Stepper Motor Driver with radiator