Need a support and not a good place to add support bar to wall. The directions were not the best but I was able to figure out using the pictures. It seems to be a solid design the the locking parts to hold all together. Looked easier to put together than the ones that sit on the floor. Install went fine it was just hard for me to get at the nuts under the seat. Once I got it all screwed together, it was very strong and easy to use. There were two widths it could be set at for different size people where so many accessibility aids are set to the 16" to 17" only.The holes in the back for the locking pins are wide and I figured out why. The bars lift up just enough to be able to clean under the front supports (I can imagine them getting dirty). You can also change the width after they have been installed with the push in locking pins.The front supports are under the toilet seat and are really stable. I was worried at the larger width they would not have enough front support but they actually did. They made standing so much easier and stable with an injured leg. I do highly recommend.