I purchase six of these and as you can imagine I was a little concerned about quality. These stools are great. Each stool took about 20 minutes to assemble and all parts fit perfectly and were high quality finish. I strongly recommend an electric screw driver fitted with a hex bit for assembly, as included simple allen wrench would surely become tedious after a few screws. Screw and washer counts were exactly correct and hardware was very high quality. Screws were hex head (one size) and pre-coated with thread locker. These screwed into steel inserts which were set solid and true into the mating parts. Not a single insert failed in tightening on any of the six chairs.  Swivels are solid and smooth. Chairs are attractive and comfortable.  One other buyer's comment gave me reason to hesitate. It was that the swivel assembly did not leave sufficient clearance for chair to move without rubbing upon itself. Perhaps this has been fixed, as I didn't have any such issue.