Which preposition to use with specs

at Occurrences 3%

"If you please, Misto RichmondI left my specs at home."

from Occurrences 1%

"Slaves didn' know what to 'spec from freedom, but a lot of 'em hoped dey would be fed an' kep' by de gov'ment.

on Occurrences 1%

I've checked the specs on the asteroids you've selected and I've checked progress with what Stubb is doing.

Which preposition to use with  specs