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For an overview of sledgehammers in the Fallout series of games, see sledgehammer.
FOBoSLogoThe following is based on Fallout: Brotherhood of Steel and has not been confirmed by canon sources.
Imagine the shock and horror of seeing a sledgehammer coming for your face. Now, imagine that hammer wrapped in razors and spikes. The Spiked Sledgehammer has the ability to cut through weaker forms of armor.

The spiked sledgehammer is a blunt melee weapon in Fallout: Brotherhood of Steel.