Assertion: ball bearing | /r/HasProperty | cylindrical unit
Facets:
value: with very small diameter
type: OTHER
value: compared to the length of roller
type: OTHER
Source sentences:
text: A roller bearing is a cylindrical unit that is used to provide low-friction movement for a bushing or bearing block.
text: Needle bearings are the cylindrical roller bearings with very small diameter compared to the length of roller.