Parts List One Back PCs of ยข8x18x1 flat washers Step 1: Fix the two round holes in the middle of the back and the two round holes in the middle of the seat ring with two M8x50 short screws and two flat washers 8 pcs of M8x60 long screws Step 2: Fix the four round holes on the two legs of the back and the four round holes on both sides of the seat ring with 4 M8x60 long screws and 4 flat washers FL 1 pc Tool wrench Step 3: Fix the four round holes of the two front legs with the four round holes in the front