The Williams JHW4-140B 2 1/2 Inch Impact Universal Joint has a 1/2-Inch drive and a black industrial finish. It has been specially heat treated for impact use to provide long life, safety, and durability. It has a spring plunger that provides secure socket retention for safety and convenience and is suitable for use with pneumatic and electric impact wrenches. For over 140 years, Williams has manufactured high quality industrial tools for professionals like you.  Every day we purposefully choose our next product innovation by examining and understanding your needs, because we know you value your work and pride yourself in being the best. We develop tools strong enough to endure extreme industrial conditions.  Leveraging our heritage of making great tools, with the right materials, and precise engineering specifications. Since 1882, Williams had made products designed to be put to work with confidence.