Rutland 36531 Rectangular Wire Chimney Sweep Brush, 10 by 6-Inch 10" x 6" rectangular 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.Use a poly brush if you have a steel liner