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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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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