Cast-iron used in a sentence

Cast-iron in a sentence as an adjective

Better have some cast-iron choice-of-law clauses in those trade agreements!

Grandma's ancient cast-iron frying pan over burning wood scraps in the back yard, make a nice veggies-and-shrimp stir fry.

With what seems to me to be a series of cast-iron statistical analyses, he shows that this has, in fact, never been proved ...

They are a cast-iron ***** to do anything programmatic with; whole companies have been created just to tackle that problem.