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Tip of the screw driver needs to be magnetic and strong simultaneously, so pure iron or pure stainless steel cannot be used. This is so because pure stainless steel cannot be magnetized and pure iron is not strong.

What we use is called the mid steel. Mid steel has 98% of iron and 2% of strengthening materials. It is both strong and magnetic. This is why we use steel (mid steel) in making screw drivers.

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