Ball-peen hammers are commonly used for shaping and bending metal objects. But did you know that these hammers have other names as well? The ball-peen hammer is also known as the engineer's hammer, machinist's hammer, or peen hammer. Another common synonym for the tool is the blacksmith hammer, which is used for forging and shaping metal. The term "peen" in the name refers to the rounded end of the hammer, which is used to shape metal in a concave manner. Other types of hammers include claw hammers, sledgehammers, and mallets, which have their own unique uses in construction and metalworking.