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chamfer of drilling rate

Drill bit — For the fictional character, see Drill Bit (Transformers). For the cancelled skyscraper nicknamed Drill bit, see Chicago Spire. For the types used in drilling wells, see Well drilling. From top to bottom: Spade, lip and spur (brad point), masonry … Wikipedia
Countersink — A countersink is a conical hole cut into a manufactured object, or the cutter used to cut such a hole. A common usage is to allow the head of a countersunk bolt or screw, when placed in the hole, to sit flush with or below the surface of the… … Wikipedia
Fertiloscope — The Fertiloscope is a type of laparoscope, modified to make it suitable for trans vaginal application, which is used in the diagnosis and treatment of female infertility.This relatively new surgical technique is used for the early diagnosis and… … Wikipedia