HeadHunters, Jazz Brush, Pair of Retractable Wire Drum Brushes.
Use a standard 7/16" diameter tube with a comfortable rubber grip. The O/D diameter is just over 5/8 of an inch. The wire gauge is a standard .011 inch. The Jazz brush comes with an adjustable pull rod so the wire fan can be set to 3 fan settings. The wire can be retracted into the internal tube with the pull rod fully extended back.