Freestyle > Manipulating the Dragger > About Snapping the Dragger to a Reference
  
About Snapping the Dragger to a Reference
You can snap the dragger to a reference while translating the dragger along its handle. Snapping the dragger to a reference relocates or repositions it. To snap the handle of a dragger, hold down the SHIFT key and select a geometry type listed below:
A mesh element, that is, a face, edge, or a vertex
Datum plane
Planar surface
Datum point
Curve and edge point
Coordinate system
Reference axis