The head of an engineer's ball-pein hammer has a flat end for striking punches, drifts or cold chisels, and a rounded end for spreading a rivet head. The best tools have a head of drop-forged steel and a handle of ash or hickory wood.

A ball-peen (also spelled ball-pein) hammer, also known as a machinist's hammer, is a type of peening hammer used in metalworking. It is distinguished from a cross-peen hammer, diagonal-peen hammer, point-peen hammer, or chisel-peen hammer by having a hemispherical head.

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