A hammer is a hand tool used for driving nails and striking objects. It is one of the oldest tools in human history. The modern hammer has a steel head and a handle of wood, fiberglass, or steel. The head has a face for striking and a claw for pulling nails. The weight varies from 16 to 24 ounces for a general-purpose hammer. A heavier hammer drives larger nails. A lighter hammer gives more control. The choice depends on the task.

Hammers come in several types. A claw hammer is the standard for carpentry. A framing hammer is heavier and has a longer handle and a waffle face for gripping nails. A sledgehammer is a large, heavy hammer for driving stakes and breaking concrete. A tack hammer is small and light for upholstery. A ball-peen hammer is used for metalwork. A rubber mallet is used for tapping without damaging the surface. Each has its own purpose.

The hammer is a simple tool, but it requires skill. A misdirected blow can bend a nail, damage the wood, or injure the hand. The user must grip the handle firmly, swing from the elbow, and strike the nail squarely. Safety glasses prevent eye injury from flying fragments. A hammer is not just a tool. It is an extension of the hand. It is a symbol of construction. It is the sound of work.