Arduino UNO shield for CNC driver expansion board

Model: AA002.
Arduino UNO shield for CNC driver expansion board.
GRBL 0.9 compatible. (Open source firmware that runs on an Arduino UNO that turns G-code commands into stepper signals).
PWM Spindle and direction pins.
4-Axis support (X, Y, Z , A-Can duplicate X,Y,Z or do a full 4th axis with custom firmware using pins D12 and D13)
2 x End stops for each axis (6 in total).
Coolant enabling capable.
Uses removable A4988 or DRV8825 compatible stepper drivers.
Jumpers to set the micro-stepping for the stepper drivers. (Some drivers like the DRV8825 can do up to 1/32 micro-stepping).
Compact design.
Stepper Motors can be connected with 4 pin molex connectors or soldered in place.
Runs on 12-36V DC. (At the moment only the DRV8825 drivers can handle up to 36V so please consider the operation voltage when powering the board.)