Stahlwille Ring Insert Tool for Torque Wrenches with Internal Square Drive is drop forged, hardened, and cooled in an oil bath to provide high torque and added leverage. It is used for Stahlwille torque wrenches. Fixes the torque wrench by a security pin. This ring insert tool fits any 9x12mm square drive mount. Its slim profile allows the ring insert tool to fit into tight spaces. The forces applied are transferred ideally to the flats of nuts & bolts. This allows even large forces to be applied without causing damage to the bolt and nut. It is finished with chrome plating over nickel, durable, and chip resistant. Made of course in Germany and manufactured under the most stringent quality control conditions and specifications. As a traditional German company from Wuppertal, we have stood for tools that are valued worldwide for their excellent quality for over 150 years. Stahlwille is the name of problem solvers. From screw extractors to pipe cutters, our products do a better job and stand up to even the toughest tasks. We offer a wide range of special-purpose and demolition tools that allow your technicians to complete the job without any high-quality problems. Simple to use, top quality, and durable. Stahlwille is recognized as being a leading, worldwide pace-setter in the hand tools industry and its name has always stood for tools that go well beyond the standard solution. Stahlwille products provide a lifetime of trouble-free service built with uncompromising quality.