Universal Tool Internal Spline Drive Tools feature machined carbon fiber blades for lubrication free operation, the highest precision engineering, ensuring 600,000 cycles of use, an internal silencer baffle that reduces noise pressure level to 75 dBA and precision needle bearings and gears and a gear case interchangeable with leading brands.Universal Tool Internal Spline Drive Tools feature an advanced ergonomic handle design with insulated coating for maximum operator comfort, a ported throttle valve for precise variable speed control, an internal spline drive for use with Universal Tool or Jiffy ‘L’- Foot and Pancake drilling attachments and are best for continuous precision air frame work.