What Does S2 Mean on Tools' Steel Bits?

Klein Tools has designed a set of Impact Power Bits for the professional electrician. All the bits are made of high-impact rated S2 steel and color coded for easy identification. The 1-1/4-Inch (6.4 mm) long driver bits are easier to grip than a standard 1-Inch (25.4 mm) bit. The bit holder and nut drivers have strong magnets, and are also designed longer so they reach easily into junction boxes. Minimal chamfering on the nut drivers.

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