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The hammers inside pianos are at Hammer (piano)
Head of a hammer
A claw hammer

A hammer is a tool for putting nails into objects such as wood. It has a long handle, and a tip with a flat end for hitting nails. The most common type of hammer (sometimes called a claw hammer) has a curved end (on the other side of the hitting end) for pulling nails out.


A sledgehammer

A sledgehammer is a hammer that has a longer shaft, and a more massive head. That way more force can be applied.

Hammers as weapons

Hammers were sometimes used as weapons.