Drill head insert or drill head attachment and drill
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Drill bit insert or drill head attachment as well as drills
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drill
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drill
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Drill has constant core diameter in area of spiral coil, where bevel extends at spiral coil, whose width changes partially over course of drill head to clamping end
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drilling
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Drill bit i.e. three-lipped core drill bit, for drilling steel reinforced concrete, has main blade extending between drill bit part and auxiliary bit part and formed as single piece with bit head, where main blade is attached to wing blades
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Drill e.g. hammer drill, for stones, has spiral coils clamping shell surface and extending spirally around core, where core exhibits bend and reverse bend running within shell surface
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Drilling body has shank and one or multiple drilling flour exhausting slots and one or multiple spirals with smaller diameter opposite to shank
