The tool provided is mild steel. Everything just got tight. The chair is VERY solid throughout. Lower back is obsessive for me. If you need a lot of lower back, this would be great for you! Armrests are like stones. It's relatively easy to assemble, everything fits, but as I said, the tools that came with it are rubbish. every part is good. I may be dated in 2020, but I still feel like this isn't a $166 chair. If it takes a year I will try to come back and update this review. For me it becomes a chair for every day, 4-6 hours very at night. To be honest I'm a tall guy, 5ft 10", 260, I'm picky about my chairs. I think a big part of the price of this chair is shipping. a little more comfortable. I bought it mainly for short term use until more than $$$ chair is here. The armrests fold down fully as shown.
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