"I was thrilled to find a product that would allow my two cats to enjoy the window without taking over a shelf. The actual size of the product was large enough for the two of them, and appeared sturdy enough to support them. We never had the chance to test that though, since it didn't fit our windowsill. We were shocked, especially since the product is described as fitting windows wider than 24". What the makers fail to mention is that unless your windowsill is at least 4 inches deep, this product is worthless. If you have a turning handle on the sill which opens and closes the windows (and less than 4 inches of space), save your time and money, as the cat napper will not fit, even with only screws."