The t post are high carbon steel. They are as hard as most drill bits. That is why you are having troubles. The cobalt bits will work a little better but not much. Are you using any oil or cutting fluid while you are drilling???? If the post are loose where you can use a drill press plus oil/coolant then you may be able to drill them.
Like One of the other guys ask. Why go to all of this trouble when a clip on isulator is 33 cents each?????
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