Product review (1 stars): This isn't worth the headache.
This broke off inside of my dryer duct. I used an electricians line feeder to hook on to it and fish it out. The best part about the whole thing is my duct was clean. I had just purchased my house and decided to make sure the duct was clean. When I was about to give up and was reeling in the line feeder out popped this thing with no restriction. Was barely even dirty, so basically the impact of this thing spinning against nothing was enough to break it. I would hate to see what a mess this would have caused if my duct was neglected. I considered returning it, but the idea of undoing a dozen feet of threaded rods duct taped together seemed exhausting after everything that day. It was much more satisfying to throw the whole thing in the trash where it belonged.