双螺旋钻头
/ˈdʌbəlˈɛdʒd ˈɹeɪzə/
n
English: double-twist auger bit · 双螺旋钻头
English · double-twist auger bitEspañol · broca salomónica de canal angostoFrançais · mèche hélicoïdale à double torsade
释义：Bit made up of two opposing twists; it removes debris quickly as the hole is drilled.