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Step 4:
Click on sketcher work branch  
and then click on xy plane.

Step 5:
And now you are in sketcher work branch.And now go to menu bar

                                         Insert > Profile > Predefined Profile > Hexagon

Or

Bring you pointer to zero coordinate.  it will snap this point automatically. And the picture will be something like this.

Step 6:



Step 7:

See in step 1 fig.2. We have taken D = 24 mm the Diameter of the bolt. So 2D = 48. After dimensioning the color of the profile will turn into Green color the sign of  fully constraint.

Now click here  to Com out from sketcher work branch. If you are unable to find this icon you can refer Step 3. You may get the solution.

Step 8:

                                             Sketch based Features > 

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