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I had no problems though with a hammer drill and Bosch blue granite bits. Super strong bits excellent for masonry/concrete/cinderblock. Guys in my neighborhood broke multiple bits going through our 1930 walls.
Bosch really makes a quality product. I used these for concrete drilling in my basement and they did an excellent job.
However, my holes were pretty exact in either case with the bosch drill bits. I used Simpson Strong IXP Anchor Bolts and SetPac Epoxy to "glue" (a weak word for it as the epoxy hardens harder than the cement) the anchor bolts into the cement. The epoxy meant my holes didn't have to be exact as the epoxy expands to hold the bolts in the drilled holes. Considering that I purchased a 1/2 inch drill for 1/3 the cost of this set. Great bits. The drill bit made short work of 20, 1/2 inch holes drilled about 4-5 inches deep in 5000 cement. The purchase of this 8 pack (which includes the 1/2 inch) was a good deal. Used a Milwaukee 5380-21 drill also purchased on Amazon and made short work of securing hand rail flanges in the cement.
Bosch out did themselves with these, they really live up to the Bosch reputation. And the really great thing is that they stay sharp, even after 'several' holes. Great Drill Set. These really cut through concrete in short order.
I think someone needed them more than I did. After using some bits from another company, I realized how good they really are. I used these bits for over a year and was very happy with them. I will re-order these bits from Amazon soon. I would recommend them to someone who does it all like me. Used them to drill into concrete, plaster and block with great success. The only problem is, they came up missing while doing a job with my son-in-law with other contractors on site.
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