There are many other things to consider when choosing the right drill bit for hardened steel. This post will cover what you need to know about drilling hardened steel and provide you with some suggestions on the best drill bits that will work well for your needs.
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1/2 Blade Dia,1-3/8'' Straight Flute Length;3'' full length; 118 Degree Point;TIR:<10um(0.01mm),Made of Solid Tungsten Steel,uncoated long tool life
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Best Drill Bits for Hardened Steel