precast vs set in stone

precast

noun
  • Structural members made of concrete, ready for installation. 

verb
  • To cast in a location other than where to be installed. 

adj
  • Cast previously in another location. 

set in stone

adj
  • Permanent; certain; firm. 

verb
  • To render something permanent, certain, or firm. 

How often have the words precast and set in stone occurred in a corpus of books? (source: Google Ngram Viewer )