Product review (5 stars): High quality, easier to use than I thought it would be.
I used this in conjunction with their 12 foot extension kit. It worked perfect to clean out my sheet metal dryer ducting. The brush is designed like a screw, so it dragged itself easily through the entire vent system, even the short 90 degree runs. I was surprised. Never "reverse" the direction of the drill, the rods may come apart inside the vent. Instead, just pull gently with the brush still rotating. Don't put more than 2 rods together outside the entrance to the vent hole as the rods are flexible enough that they will want to "twist up together" if you do. Very happy with the quality and ease of use..