Product review (4 stars): This should come with every clothes dryer.
Cleaned out a 12' long dryer duct with no issues.

I put super glue on the brush threads to hold it on...forever.
Taped joints per directions; just in case i reversed the 12V cordless drill I used to spin the brush.

This should last through many yearly duct cleanings.  A great way to spend about 30 minutes every year!

Not 5 stars because it didn't have a handle for the end so people with out a drill could easilt turn it for the best cleaning.