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What is this tool called?

Daniel SchmittDaniel Schmitt ✭
in General
Hi all, 
I'm having a little language problem and maybe someone can help. I'm looking for the name of the drill bit people use to drill half-spherical holes for keys in plaster. Since I don't know what it's called in either German or English, I was wondering if anyone could tell me what it's called in English so I can look it up in a dictionary. Thanks!

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    Chris EllerbyChris Ellerby Admin
    Hi Daniel,

    Not sure about the exact tool you are after, but to route/grind/drill a hemispherical indent you could use a round nose router bit, or a ball burr.

    /Chris
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    Paolo GiovaniPaolo Giovani ✭
    The tip I've seen used in the lessons so far is always a round router bit, it isn't even made for drills, it's a tip for a woodworking tool called vertical router, you can find it anywhere it's a very common tool.
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