These stool are sturdy and surprisingly quite comfortable.  They came very well packaged and included an allen wrench and hex wrench which are all you need.  Worried they may be light gray but mine are a dark gunmetal gray- almost black- which is exactly what I wanted.  Wayfair can be adjusted to your preferred height and seats are stable at all adjusted heights.  Had no trouble locking height into place.  Over time the seat locking lever may loosen but is a cinch to tighten.  The stools fit under my island overhang - a feature I wanted to maximize walking space.  Expect these to last quite some time.  Should I ever get tired of them in the kitchen they can be used most anywhere for convenient extra seating.  Must be a good solid pour of cast iron as they are quite heavy.