For jobs that require a hammer with more heft and hardness than the usual claw hammer, try a ball peen hammer. Sometimes called an "engineer's hammer" or a "machinist's hammer", it's often the best hammer to use for metal. Use it to drive cold chisels, setting rivets, and shaping metal. The steel head of a ball peen hammer is harder than the head of a claw hammer, so it's less likely to chip on contact.