These are heavy duty
Verified Post by Harry Harney
Published on 19 Oct, 2020
Johouse 12PCS Masonry Drill Bits Set, Professional Masonry Bit Tile Drill Bits Set Concrete Drill Bit, 4mm to 12mm
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They have been used about 40x so far already. They handled each thing with ease. I even drilled through concrete with a set of these and they were still sharp after.
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