Jernberg is a large forging, machining workshop. It uses completely integrated machining cells that incorporate up-to-date technology, such as turning, drilling, milling, broaching and induction hardening. Specializing in the auto industry, Jernberg claims to be the largest independent manufacturer of "highly engineered forged components." Jernberg is a subsidiary company of HHI Group Holdings LLC, having been sold to them in September 2005.