Snap to Object
With Snap to Object, the SmartCursor finds specific parts of an object, such as corners, endpoints, or centers of linear and circular objects. Cues display near the snap point to identify the location.
 
1.
The 3D Snapping dialog box opens.
2.
Select Snap to edge points, and then click OK.

SmartCursor and Constraints : The Constraints Palette : Snap to Object

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