We found one dictionary that defines the word drilling bits:

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1. Drilling bits: Wikipedia, the Free Encyclopedia

(Note: See drilling_bit as well.)

Definitions from WordNet (drilling bit) ▸ noun:  a bit used in drilling for oil ▸ Also see drilling_bit ▸ Words similar to drilling bits ▸ Usage examples for drilling bits ▸ Idioms related to drilling bits ▸ Wikipedia articles (New!) ▸ Words that often appear near drilling bits ▸ Rhymes of drilling bits ▸ Invented words related to drilling bits