I bought four of these and liked them so much I ordered another set.  After using the hex tool that came with the chairs to put together the first set, I opted to use a 5/32 drill bit to put together the second set.  This cut the assembly time down from about an hour and a half to 20 minutes.  The biggest amount of time to assemble the chairs is removing the packing.  They are extremely well packaged.   The chairs are very comfortable, well built and look incredible in my newly updated modern kitchen!