mèche hélicoïdale à double torsade
/ʁazwˈaʁ a ˈdubl tʁɑ̃ʃˈɑ̃/
n
English: double-twist auger bit · 双螺旋钻头
Sens：Bit made up of two opposing twists; it removes debris quickly as the hole is drilled.
English: double-twist auger bit · 双螺旋钻头