We bought this adjustable bedframe for my elderly mother.  It has an option to use either the 7 inch legs or the 3 inch legs when putting together however, the 3" option didn't work because it needed the Nuts to screw onto the bolt (not included) but maybe your not supposed to use the really short ones by themselves? Anyway, we used the 7" legs and the rest of the parts were already put together. Except you need to plug the unit into the wall and also into the bed underneath and preset the controller by holding down buttons on the hand held remote control and pushing a button on bottom of bed unit. Do this before you set the bed on its legs. Great quality, sturdy, quiet  works great! Recommend 2 people to set up.