Assertion: drill bit's shank | /r/HasProperty | common
Facets:
value: on countersinks
type: LOCATION
value: before 1850
type: TEMPORAL
Source sentences:
text: This shank was common before 1850, and is still in production.
text: Round shanks are common on countersinks used for hard metals because they're designed to fit machine chucks (though they fit other types, too.)