In the holes drilled in a wooden tube in the concrete wall, there is always a lot of sand and dust. To remove them will help plastic or metal tube by simply inserting it into the hole and how to blow into it (but mind your eyes!).
S. DOROFEEV, p. vokhtoga, Vologda region.
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To reduce the time for selection of drills and taps the desired diameter can be, if you whiten them with chalk engraved on their shanks marking. POLYAKOV
