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Message: <blockquote data-quote="walio123" data-source="post: 106576" data-attributes="member: 9827"><p>I've tried this with a rock auger drill and if you hit something solid like granite, it does not work. The only thing you can do is damage the screw. Because the holes are not deep, there are rock boreholes of such a diameter, I think they will be able to do this job. They work with a compressor/like impact hammer/ and the hole / ground / must be dry so they can blow the dust. However, if there are so-called floating stones, it will be almost impossible for this probe too. If the holes do not have to be exactly positioned you can try with rock auger and if you hit some hard just change plase for hole.</p></blockquote><p></p>