I saw these bed risers on another sight but they were out of stock, so glad to see Target carry them. We added grips to the bottom to keep secure on a wooden floor. They were a great height and a much better quality than the plastic bed risers.
I needed just a little more room to slide my trundle bed under the main bed after buying new mattresses. These raised the main bed just enough to allow the trundle to glide in easily. The wood looks really nice, too, not at all like the plastic would have.