Horrible product. I bought 2 chairs. The first one was missing 2 bolts, but 2 random screws not even needed for the assembly were included, bad splinters on 3 of the Seat splinter, and the back of the chair couldn’t be fitted to the back-stop as the angle was 3 inches off... who ever built that one was probably asleep or blind. 
The second chair was also defective, the arm rests were wobbly due to the significant gaps between the planks.
Dangerous product and sub standard quality. Wayfair - this product is unsafe.