We will now select the 4 curves that form the head of the spanner and mirror them.

1.Select the 4 curves as shown below. Hold down the Ctrl key to select multiple objects.

2.With the 4 curves selected, you will notice that VisualCAD's Modify mode automatically becomes active and that the Transform Ribbon Bar becomes available.  Refer to the menu image below:

3.Now there are two methods to activate the Mirror command.  Select the method that suits you best.
You can select the Transform Ribbon Bar tab and then select the Mirror icon as shown:

- or -   While the 4 curves are selected, you can simply Right-click and select Mirror from the pop-up menu as shown below:

4.From the Mirror selected objects dialog box:
 
Set the Mirror Plane to XZ Plane
Leave Point (P) as Origin since the origin lies on the center line of the part.
Check Create Copy
Pick OK.
 
The curves are mirrored as shown below.