Rutland 16507 7-Inch Square Wire Thread Fitting Chimney Sweep, 1/4-Inch Pipe 7-inch square wire chimney cleaning brush for masonry or tile chimneys Made with sturdy, oil tempered spring wire cleans out soot, creosote, and any other buildup in your chimney Designed for the do-it-yourself homeowner to make chimney cleaning easy 1/4" NPT male threading fits all Rutland 1/4" NPT rods (Items: 10624, 10672, KRK-18) Match brush size to inside measurements of your flue for best results