A Hammer is a tool that players use primarily for Smithing and Construction. It is stored on the toolbelt so players never need to carry one in their inventory. It is also used in many quests, for example, in Dragon Slayer and In Aid of the Myreque it is used to hammer in nails, and in Animal Magnetism it is used to make a magnet. The use in quests is however now obsolete, again due to its position on the toolbelt (With the exception of The Great Brain Robbery wherein the player must give a hammer to Dr Fenkenstrain as part of the supplies he needs).
If a player wishes to acquire the item for their inventory, it may be bought from most general stores for 13 coins. They are also found upstairs at the Falador forge, and in a crate near Lumbridge's furnace.
In a Player-owned house players can take infinite hammers for free if tools of any level is built in the house's workshop.