(plural tool and dies or tools and dies)
- One of the cutting tools and forming dies used by machine tools
Mostly used as an attributive noun.
- The toolmakers are employed in tool and die jobbing shops
- Wage rates for tool and die makers differ in various regions of the country
Singular use as a noun directly almost never occurs, usage is usually in the plural.
- The manufacture of tools and dies is on the critical path of automobile development programs