The Drill Powered Duct Brush helps to remove lint build up and debris in your dryer duct as well as other general ducting. This brush can be used manually or attached to a drill for increased power. The brush kit includes a 4 in. of diameter brush head and 4 2 ft. flexible rods that can be used to extend the brush up to 8 ft. in length.Suitable for typical clothes dryer duct runsFlexible nylon rods allow for up to 90° turnsUsed to clean lint and debris from the dryer duct by access through the end of the dryer ductAlso used to clean lint and debris from the dryer duct by access through the exhaust cap on the outside of the home