I would guess cheap or dull bit first off. Its amazing the difference in a sharp quality bit and a cheap one. If the drill is hammering, you will be able to tell easily. As has been said hit it with high speed.
Yes, its hammering and I'm using low speed.
Yeah...Bosch bits for the win! That was my problem...****** drill bits that came with the kit.
I bought 4 bits "just in case" and just needed the one to zip right through it. Good to know!
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