Latest CNC Shield Version 3.0GRBL 0.8c compatible. (Open source firmware that runs on an for that turns G-code commands into stepper signals)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)Spindle enable and directionCoolant enableUses removable A4988 compatible stepper drivers. (A4988, DRV8825 and others) to set the Micro-Stepping for the stepper drivers. (Some drivers like the DRV8825 can do up to 1/32 micro-stepping )Stepper Motors can be connected with 4 pin molex connectors or soldered in placeRuns 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.)Colour:Photo ColorMaterial:plastic+metalPackage Contents:1 x CNC Shield V3.01 x for UNOR3 Board4 x A4988 Driver4 x 4401 Stepper Motor1 x USB CableOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.