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Can drive four axes: four receptacles for A4988, DRV8825 or other StepStick compatible drivers.; Headers for XYZA steppers, XYZA end stops, spindle control, ESTOP.; Screw terminal block for power input.; Compatible with GRBL firmware.; This board uses CH340 USB-to-serial interface chip, instead of 16U2 (USB drives installed automatically under Windows 7/8).; Added 3 rows of holes for wiring.; Added 2 rows of holes for dupont style headers (headers are useful if you connect cables directly to Arduino board).; 1 x CNC V3 Shield1 x UNO R3 Arduino compatible board4 x A4988 Stepper Drivers with heatsinks