This product is expected to ship within 10 business days of your order date. This is V5 of our Heavy-Duty Z, or HDZ, an upgraded Z/X axis for your Shapeoko 4 or Shapeoko Pro. HDZ is precision-milled and designed around a ball screw and linear rails. It will move your Z-axis with ease, even with a weighty spindle installed. The HDZ comes pre-assembled and ready to fit your Shapeoko Pro or Shapeoko 4. Compatibility: * Shapeoko 4 * Shapeoko Pro Note: The Shapeoko 5.1 Pro already includes an equivalent Z-axis, so the HDZ is not compatible, or required, for the Shapeoko 5.1 Pro.