Sioux Pneumatic Screwdrivers, Right Angle Nut-runners, Ratchet Wrenches Impact Wrenches & Impact Driver Assembly Tools have been designed and manufactured in the USA for over 100 years. To keep up with the rapidly growing demands of modern assembly applications, Sioux pneumatic assembly tools remain on the cutting edge of engineering design. We continue to be innovative in creating new air assembly tools to provide faster rundown speeds with exceptional accuracy and consistent torque delivery, combined with ergonomic design for operator comfort and safety. We build every tool to help assembly operators become more productive. We believe they deserve tools that will help improve their quality of performance and maximize the skills they bring to the job.