"Used these for drilling into hard limestone in a stone built house, a job that usually burns out drill bits if they make any impresion at all. The 8mm bit drilled 70mm deep holes to fix a tanking membrane with no problem, though the first bit burnt out after such 15 holes. The second bit is still going strong having done twice as many holes. Excellent performance at a good price. Highly recommended."
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Review 6 for DeWalt 8 x 120mm Extreme 2 Masonry Drill Bit