Stahlwille 58231017 17mm Open Ring Insert Tool - 9mm x 12mm Mount

17mm open ring insert tool for torque wrenches with a 9mm x 12mm rectangular drive.Fixes to the torque wrench by a security pin.Features a bi-hex profile.Made from nickel which has been drop forged, then hardened and cooled in an oil bath before getting a chrome plating, making this torque wrench ring insert tool durable and chip resistant.