clasp vs hook and eye

clasp

noun
  • A fastener or holder, particularly one that clasps. 

  • An embrace, a grasp, or handshake. 

verb
  • To shut or fasten together with, or as if with, a clasp. 

  • To take hold of; to grasp. 

hook and eye

noun
  • A matched hook and an eye (loop into which the hook can fit), used for fastening. 

How often have the words clasp and hook and eye occurred in a corpus of books? (source: Google Ngram Viewer )