You hang the accessories; the candle holder, the hook or the cuttings pipe, onto the wall ledge from the top and move it around as you like. You can also use the wall ledge just as it is. You can put two or more along side of each other.
On the back of the wall ledge you’ll find two milled cuts to cover the screws. You put up two countersinked screws on the wall (with a distance of 55 between) to hang the wall ledge on.