Which of the following objects famously pierced a man's brain in 1848 without killing him?

The famous case of Phineas Gage in 1848 involved an iron rod (tamping iron) piercing his brain. Gage was a railroad worker who survived an explosion that drove a 13-pound iron rod through his left cheek and out the top of his skull, dramatically changing his personality. This case became fundamental to understanding brain function and personality.