FIELD: metal processing. SUBSTANCE: twist bit has cutting end with chip-disposal flutes 1 and backs 2,3. The central angle θ between chip-disposal flutes 1 in the cross section is not equal to 180 degrees, that results in inequality of backs 2 and 3. Larger back 2 has helical groove 4, having inserted or rolled-in tube 5, which forms a closed duct to supply cutting fluid to cutting zone. EFFECT: enhanced wear resistance, improved supply of cutting fluid. 3 dwg
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