A set tool is a blacksmithing tool

Tool

A tool is a device that can be used to produce an item or achieve a task, but that is not consumed in the process. Informally the word is also used to describe a procedure or process with a specific purpose. Tools that are used in particular fields or activities may have different designations such...

 meant to be struck by a hammer

Hammer

A hammer is a tool meant to deliver an impact to an object. The most common uses are for driving nails, fitting parts, forging metal and breaking up objects. Hammers are often designed for a specific purpose, and vary widely in their shape and structure. The usual features are a handle and a head,...

, either a sledge or power

Power hammer

Power hammers are mechanical forging hammers that use a non-muscular power source to raise the hammer preparatory to striking, and accelerate it onto the work being hammered...

. Set tools are usually made with a handle to keep the smith a safe distance from the action. Set tools for the anvil

Anvil

An anvil is a basic tool, a block with a hard surface on which another object is struck. The inertia of the anvil allows the energy of the striking tool to be transferred to the work piece. In most cases the anvil is used as a forging tool...

, where they are struck with a sledgehammer

Sledgehammer

A sledgehammer is a tool consisting of a large, flat head attached to a lever . The head is typically made of metal. The sledgehammer can apply more impulse than other hammers, due to its large size. Along with the mallet, it shares the ability to distribute force over a wide area...

, often have a wooden handle set into the head in the same way as a hammer. Set tools are sometimes handled by wrapping a thick wire handle around a groove in the body of the tool. Set tools to be used under a power hammer are much shorter than traditional set tools and the handle is usually arc welded on or forged integrally with the tool.