Sometimes the drills, especially in the already served, without distinction, the marking indicating the diameter. It would seem that to define it is only possible with a micrometer. But here’s a simple and fairly accurate method of measurement with… grip. Drill clamped in their jaws, and remaining between them a gap corresponding to the diameter of the already available ordinary ruler with millimeter divisions.
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In your journal in one of the rooms of yesteryear has published an article — "the plug". I must say that the proposed options combined metal dowels rather complicated to manufacture, but...
