Die makers are individuals who make structure of a variety of tools in different shapes used for creating replications of those tools. Die makers also provide services in stamping die design, building, and die tryout, die maintenance and repair, wire EDM, and CNC machining, as well as general machining. Die makers need to have an intrinsic knowledge of art and science. Mechanical engineers and tool and die makers often work in close consultation. Die making is a subgenre of tool making, focusing on making and maintaining dies including making punches, dies, and steel rule dies, and die sets. Die makers rely on precision for accurate production of parts.