Manufacturing quality is awful.  We bought these stools for my daughter's apartment. My daughter complained that the one of stools keeps loosing its height in few minutes after even no-one  sits on it.  Just recently I visited her and got a chance to assess the issue.  The problem is the the lever assembly protrudes above the level circular base to which the seat is screwed.  Once the seat is screwed, and secured tight to the base, the wooden base of the seat always pushes the lever down that basically looses the pressure in the cylinder and the base comes out.  If I put shims between the base and the seat, the screws are not long enough to safely secure the seat to the base.  Now I have to run around to look for similar but longer screws.  It is matter of lack of quality control during manufacturing. I don't recommend this manufacturer nor Wayfair unless they address this issue to my satisfaction.  Essentially one of the stools is essentially is not a barstool to begin with.