These chairs are a bit challenging to assemble. The working space and the tools provided are not quite up to the task. The awkward position that you are in with your hands and arms to connect the seat to the stand caused me to injure the muscles in my forearm because of the torque needed to tighten the bolts under the seat. We also had some parts that needed to be replaced because they were out of alignment. Customer Service at Wayfair was very helpful in getting us a replacement arm for the chair.