rivet

heavy pin having a head at one end and the other end being hammered flat after being passed through holes in the pieces that are fastened together

ornament consisting of a circular rounded protuberance (as on a vault or shield or belt)

direct one's attention on something

Please focus on your studies and not on your hobbies

hold (someone's attention)

The discovery of the skull riveted the paleontologists

fasten with a rivet or rivets