How is the iron blade in tools fixed to the wooden handle?

Many tools such as hammers and axes have iron blades attached to wooden handles. The iron blade usually has a ring that is slightly smaller than the wooden handle.

To fix the handle, the iron ring is heated. When heated, iron expands and the ring becomes larger. The wooden handle is then inserted into the ring. When the iron cools down, it contracts and fits tightly around the handle.

This method ensures that the blade remains firmly attached to the handle.