Ultra Clean Holdings, Inc. designs, develops, prototypes, engineers, manufactures, and tests production tools, modules, and subsystems for the semiconductor capital equipment and equipment industry segments primarily in North America, Asia, and Europe. It offers precision robotic systems that are used when accurate controlled motion is required; gas delivery systems, which include one or more gas lines consisting of small diameter internally polished stainless steel tubing products, filters, mass flow controllers, regulators, pressure transducers and valves, component heaters, and an integrated electronic and/or pneumatic control system; and various industrial and automation production equipment products. The company also provides subsystems, such as wafer cleaning sub-systems; chemical delivery modules that deliver gases and reactive chemicals in a liquid or gaseous form from a centralized subsystem to the reaction chamber; frame assemblies, which are support structures fabricated from steel tubing or folded sheet metal; and top-plate assemblies. In addition, it offers liquid delivery systems; process modules, which are the subsystems of semiconductor manufacturing tools that process integrated circuits onto wafers; and other high level assemblies. The company primarily serves original equipment manufacturing customers in the semiconductor capital equipment, consumer, medical, energy, industrial, flat panel, and research industries. Ultra Clean Holding, Inc. was founded in 1991 and is headquartered in Hayward, California.