Ball-peen Hammer
A ball-peen (also spelled 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, point-peen hammer or chisel-peen hammer by having a hemispherical head. Though the process of peening has become rarer in metal fabrication, the ball-peen hammer remains useful for many tasks, such as striking punches and chisels.
Read more about Ball-peen Hammer: Uses, Variants, Head Materials
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—Robert Benchley (1889–1945)