After assembling the chair I could plainly see the 5-caster base was smaller than the chair itself so I replaced the base with the base from the chair I replaced. Each arm of the old 5-caster base is 2 inches longer than the new one. A much more stable design so I disposed of the new base with the old chair. Otherwise the new chair is more comfortable than the old one.
chair is for someone 5 foot 8 or less not for a fat 6 foot tall person but got it on line stated up to 275 pds so i though large no is is not my fault for being lazy
Actually this was the second chair. First on had two slits in the fabric. I returned and Staples had a replacement chair the next day. hardware was clearly marked and went together with no problem.