The 12" Round Duct Cleaning brush is designed to clean air ducts or other applications where a vigorous scrubbing action is not required. The floppy polypropylene bristles provide a gentle action that dislodges build-up in duct systems, allowing easy removal with a vacuum. These brushes are made with a Torque Lock Connector (TLC) and are for use with heavy duty fiberglass rods. TLC has an easy to use quick connect coupling and the time saving TLC connection eliminates the need for multiple adapters. The button is recessed to avoid unexpected disconnects. This is an all-in-one system that can be used with most brushes, rods and tools.