roller bit

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Shopping	The largest selection of ROLLER BIT products: USA, UK, Canada, Deutschland, France.
TV Shop	As seen on TV: Bun And Thigh Roller, beauty, diets, exercise, household, kitchen, personal, vitamins, and other popular TV-products.

roller bit > noun, artifact
Meaning	A drill bit that has hardened rotating rollers.
Synonyms	rock bit
Broader	drilling bit, drill bit