I cannot recommend this pergola kit.  I purchased two for a side-yard project on a concrete pad.  The first went up reasonably easily but the frame still tends to shift a bit in a light wind, even after being fully tightened and anchored down with expanding bolts.  The second has a quality issue with a threaded insert in one of the beams.  Progress is stuck at about 70% complete.  I am trying to get a replacement part now but the manual doesn't have any customer service info in it.  Very frustrating, especially when I paid a little more for "quality" US brand.