"I had to get this to drill 10 x 30mm holes into 6" concrete (with hard rock beneath). Coupled with a Bosch SDS+ hammer drill it went through the concrete fast and no jams. As suspected it made little impression on the rock so used a breaker and the the drill again. All ten 600mm anchors went in. Would have preferred it to be a bit longer but as I'm unlikely to be doing this sort of job that often it was good for the job that needed doing. No sign of blunting, looks good as new - happy user"
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Review 2 for DeWalt 30×450mm Extreme 2 SDS Plus Masonry Bit