[Amps] drill bits

[carl s.]

       to all hams who may read this.!!
      Is there one among us who is a master machinist??
     I need someone who can tell me *exactly* what type of drill bit it 
will take to drill thru a steel plate, 3/8 in. thick, Very hard (altho 
hardness is hard to verify) A 1/2 in. Cobalt drill couldn't,touch it.!!! 
So , how do I drill that plate ??
   I'll give you any more info I have ( which isn't much) 
    Please let me know if you have anything to help.!!!!
    carl / kz5ca
    Mosiarc.!!!!!!!