A lump hammer or club hammer is a heavy one-handed hammer with a double-faced head. It is useful for light demolition work, driving masonry nails, and for use with a steel chisel when cutting stone or metal.^[1] In this last application, its weight drives the chisel more deeply into the material being cut than lighter hammers.

Weights range from 0.5 kg to 3 kg. The head is normally a heat treated forged steel, and handles are normally wood, usually hickory, or synthetic resin. Some hammers have a steel handle with both head and handle forged as a single piece, but these are known to have injury potential for frequent users due to shock transmission.

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