What is this tool called?
                
                                    
                                  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!
                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!
0  
            

Answers
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