Cleaned my 2 story 7" clay chimney with ease. I inserted the rods through the external clean out door which is 1.5 feet of the ground. The rods had to pass through a 90 degree bend before travelling up about 35' to the top of the chimney. I used cordless drill to spin the rods with no issue adding two pole sections at a time. Once at the top, I slowly walked backward while continuing to spin the rods with drill till all of the rods came out then disassembled into 2 rod sections and went back up the chimney. Made 2 full passes and DONE. If the rods ever happen to separate (which is unlikely) everything should fall back down the chimney and not get stuck like a regular brush would. Used to clean the metal piping from the wood stove also, but would advise taking the piping outside first due to the soot cloud the spinning brush creates. Quality seems good especially for the price. The only issue I see is the drill adaptor which could strip out over time. It would be nice if they gave you a extra one or sold it separately just in case. Ordering another set right now to give to my old man for Christmas.