For the standard variant, see Hammer.
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Hammer (Dungeoneering) detail

A hammer is a tool used for smithing melee armours and weapons in Daemonheim and is vital in some kinds of puzzle rooms as well as the Smithing skill door. Following the release of the Dungeoneering tool belt, this item can no longer be obtained as a physical object. Instead, all players have one available on their tool belt by default.

In both the three and ten statue weapon crafting, and magical construction puzzle rooms, the hammer is used with a Chisel to carve magical stones into products. It is also needed to smith battleaxes for Fremennik Scout.