I have ordered since this was "suitable for thicker tabletops" - right! My desktop is approximately 4.5 cm thick and the brackets fit perfectly, do not slip, tablecloth stays where it should be. The edges could possibly be a bit more rounded, but that would be only one tiny little criticism. Would I order again. Order was there very quickly. Whether the brackets really do not rust, I can not judge because I insets in the indoor area.