Abstract: A tool component of a machine tool comprises a functional body having at least one functional surface and a support body which supports the functional body wherein the functional body has at least one surface for fixing or guiding the tool component within the machine tool, wherein the functional body is formed at least partially from a solid material. The tool component is characterized in that the structure of the support body adjoins the structure of the functional body, the functional body at least partially has a carrying structure having cavities, and the carrying structure is formed at least partially from a hard material, a hard metal or a hard alloy on a chromium-cobalt basis.