For the below picture, is it a 2x4 or 1x2 on top? Also how does it attach to the pickets? Is it nailed/screwed to the posts?
I can't really tell.
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That's a 2x4. It would look better on both sides of the fence if it were a 2x6 or 1x6, because then it would fully cover the posts. Nail them down from the top, into the 4x4 post.