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    What is the best (best meaning most efficient) drill bit to use for drilling through 1/2" - 1" thick metal?

    Thank you in advance
    - john M


    I am not sure what diameter holes you are drilling but the Heady Duty HSS bits have a 135° split point, this makes them the best choice for the money.
    Heavy Duty Jobbers - Fractional Sizes

    If you re able to use a 1/2" shank drill, you might have better luck with 1/2" Shank Drills for larger diameter holes in carbon metal
    - John
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