While writing as stainless steel, iron-plated products were used for caulked parts. It is not all stainless steel. I wanted it to describe that the caulking part used properly for descriptive use of iron.
After all, this part could not be used because it is useless unless it is all stainless steel for use in food related parts.
By the way the burr of the stainless steel part is so great that if you use it as it will cut your hands you can not use it. It is going to scrap.