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hardened tool steel. I got push pins used for die making. They are hardened. I like them better than nails because they don't bend like nails do, but nails work fine too. I have made several molds for guys over the years and they all use nails and I have not heard any complaints. I have used the pin method for many years and have had no problems at all. A little PAM on the pins every once in a while and they come right out easy as pie. Pretty simple stuff.
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