Quote:
Originally Posted by yobeano
Maybe I'm missing something but if you are trying to get through some kind of metal before you hit the concrete then you can't use a masonry bit first. I had this same issue but my beam was square metal box encased and filled with concrete so I used a regular carbide tip bit at low speed to get me through the metal than the masonry bit to finish the hole. I used tap-cons to mount my shades and complete the job.
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Agreed and understand. It's the getting through the metal that is the difficulty I am having. I am using new carbide bits, slow speed and creeping up to the size I need (1/4"). Takes 4-5 bits and a lot of pressure.