空心钻 meaning in English

core bit
core drill
hollow bit
hollow drill
hollowbit

Core drills ; technical specifications for shell core drills
空心钻.套式空心钻的技术规范
Boring for centring pins in hollow - drilled shafts of wheel sets
轮副空心钻轴中定心销的镗孔
Core drills ; technical specifications for core drills with shank
空心钻.带柄空心钻的技术规范
Core drills with morse taper shank , long series , for the use in jig bushes
钻套用莫氏锥柄长系列空心钻
Core drills with carbide tips
镶硬质合金刀片的空心钻

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