Broken slat. Obviously was not welded on a jig...had to use dead-blow hammer and ratchet-strap to install slat assemblies. Threads both male and female were painted...be carefull of cross-threading. Once screw is started use 10mm socket and at least ratchet (preferably cordless drill) to tighten (throw away stamped wrench.) Once all screws are started sit on flat surface and finish tighten all screws. Stupid chairs look great but back is horribly uncomfortable... not much room for cushions. You're going to spend many minutes removing sticky plastic from each slat that was applied before pop-rivets were installed. A couple of slats had black washers under rivets that were obviously mis-drilled. Plan to spend about 4 hours on 4 chairs. I would say these are worth about half of what I paid for 4 chairs AND.....they don't stack.

Looks like what I expected. However, the manufacturer welded a fitting incorrectly. It is on both chairs so clearly a defect from manufacture. The seat won't attach so I can't use them. Working with Wayfair to solve some how.