Do the job
These extenders raised the co sleeper up to our mattress height, as advertised! They feel plenty secure with the sleeper tethered to our bed, but I wouldn't use them when the sleeper is free standing (which it warns you not to do.) :) Be aware that the cocoa color is NOT a perfect match to the cocoa/natural color combo, though. It's not a huge deal, but if you are bothered by such things, I figure it's better to know in advance!