CNC TOOL SETTING GAUGE This gauge is made of aluminum material. It Accurately sets Turning, Boring & Facing Tools on the Centerline of the work piece. All edges of the Tool Setting Gauge V-body are accurately machined and may be used for vial calibration to suit your intended use. The Vial body may be positioned on either side of the V-body for easier use in different applications. This tool is also used to set up grinding wheel on centerline of tooth rest for cutter grinding. It is also used to Set table stops on horizontal mills. .