A good product for the price, but I pity those who never received a hands-on engineering education. The chair are quite simple to assemble, but there are 2 basic problems. Number one, the coating of the steel parts, appears to have partially blocked the captive nut threads, and number 2, the Allen key provided is inadequate. If you have one, run a M6 tap through the threads, if not run the screws through the threads before assembly.  You really need an Allen key with a ball end, you can then run the screws into place at an angle. The screws are so near to adjacent surfaces that the standard key has to be continually reset in the screw head. I am happy and I have ordered a second set