I want to pierce a hole through a cylinder :
I've tried knife project and boolean/difference with this cylinder and it doesn't work. Any idea ?
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Edit: I've edited my post as, at first, I didn't understand your question
The easiest way would be this one:
but it also depends on what you want to do with this shape later on
Knife Project works fine.
Shift+A Add -> Mesh -> Circle 32 verts Add another cicle with 16 verts.
Scale down the 16 verts circle.
Press F to fill the faces in edit mode for both circles.
Adjust the smaller circle at the corner of the big circle.
Now select the smaller circle and press Shift select the larger circle and press Tab
Press spacebar and type knife project
A cut selection is made press delete select faces
Now delete the smaller circle.