We got two of these for our toddler girls. One bed is a crib converted into a full bed, and the other is just a regular full bed. The box springs fit perfectly in both. Ignore all the random wood pieces, its what got us through before these awesome box springs. The box springs were so easy to put together and my husband did both of them in no time. The top gray part just lays on top and isnt attached like most box springs Ive seen, but it works just the same. They provide the sturdy support that we desperately needed for their beds. They also give nice height to the mattress, so it all looks much more put together. I am very happy with these box springs! Thank you Wayfair!!