These tools are similar operation to the Flexible Arm Cutter Wing Tools except these use carbide balls for removing light scale in large diameter tubes and pipes

Tube I.D. Wing Tools-Flexible Arm Carbide Ball Tip Model Number of Balls Used
mm inch
23.8-52.4 15-16-2.1/16 PM-WTC-938 4
49.2-103.2 1.15/16-4.1/16 PM-WTC-1938 6
100.0-204.8  3.15/16-8.1/16  PM-WTC-3938 6