Cast iron is popular for cookware where an even heating temperature is important.
I use a cast-iron skillet for frying pancakes.
Three small gelignite bombs, with pocket watch timing devices, were concealed in packets small enough to fit through the slot of the standard cast-iron post box, the cylindrical bright red colored boxes so common throughout London.
Ernest has a cast-iron constitution and never gets sick.
The school's cast-iron policy on admissions fees left no leeway for needy students.