Crowbar

Overview
"Designed to open doors, crates, and to lift objects, the crowbar is now used to pry zombies' jaws off and rip them away, or to smash their skulls and bones to pieces. Surprisingly; critical hits with this weapon are quite brutal. So much so that zombies seem to be weakened after losing a chunk of themselves to it. This doesn't seem to do much against boss zombies though."