Since the hinge (black dyed iron) of the girl folding screen of a hina doll shaped in about 30 years rusted and broke, I made it of brass. It was a bit smaller than 4 mm and the screw became a brass nail, so I was worried whether it could be replaced well, but it was beautifully finished. Nails also seemed to be problematic in strength as it was longer than the iron screws that were used before. It is a golden color in the gold folding screen, which is more matched than before. The number was 4 pieces and it was exhausted without waste with 2 sets.