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Application filed by Петро Михайлович Жукровський, Петр Михайлович ЖукровскийfiledCriticalПетро Михайлович Жукровський
Priority to UA94020318ApriorityCriticalpatent/UA19807A/en
Publication of UA19807ApublicationCriticalpatent/UA19807A/en
The invention relates to cutting metals, in particular, it can be used for machining the holes. Disclosed is a combined non-detachable tool made in the form of a multi-blade tap with spiral arrangement of cutting edges. The end of tap passes into the working multi-teeth part of the cutter, countersink or drill.