What an amazing  beautiful chair!! I did put the seat on backwards only because I was building it upside down. It was no problem to change out using my drill with an Allen wrench star bit. The box of screws did come with an Allen wrench but its worth your time to drop by your hardware store with one of the provided screws to pick out an Allen wrench bit for your drill. It will cut your time in half. The chair is made of an extremely heavy resin that will withstand weather and will hold a person of 350 pounds. I love this finely balanced rocking chair and highly recommend it!!!