Thanks with you hint I've build the column with the 2 covers ;-) I started with a plane, transform it, and than Extrude it...

The problem now is that if I try to Scale the object it scales only by one side...As I said in the previous post, here there's only one edge who get closer or further the opposite one...

And I need to have a reScale like for a cylinder polygon...

Did you understand? Any help?

Thanks thanks!