For tubes 1"-1 1/4" (25.4-32mm) I.D.
Recommended for removing soft and light scale deposits in straight, ferrous and nonferrous internally enhanced tubes. The large diameter end of this brush cleans into the grooves while the small diameter end cleans the lands of the tube's rifling.
Note: ESGB Brushes require a #TCB-C Coupling ($8.00) to connect to GTC-720, GTC-721, GTC-721G
and GTC-821 Flexible Shafts. (One coupling is supplied with each brush order.)