Reduced friction technology incorporates ball bearings into the cutter wheel, tube rollers and a control knob. Each cutter includes up to 8 ball bearings for easy operation and extra smooth cut. Saves time and reduces fatigue. Cuts tube 1/8" to 1-1/8" (3-28mm). Includes a detachable swivel deburring tool for smooth surface Mastercool's new reduced friction design incorporates ball bearings into the cutter wheel, tube rollers and control knob. Reducing the resistance allows the cutter to roll fast and easy as it slices through the tube.