Review on Homlux Sliding Adjustable Roller Non Damage: The Ultimate Solution for Seamless Sliding Doors by Jason Sullivan

Nice and sturdy, you need to pre-install/mark everything and leave both casters removed so they can be bolted to the wall. This is done by leaving the bottom lock nut on the floor in the bracket guide and then screwing the rollers back into the lock nut. It's ok, you'll understand if you adjust the fit on the door before mounting it on the wall. Be sure to adjust the large wheel so that it spins freely. A simple micro-twist with pliers.