RUTLAND Chimney Sweep Square Wire Cleaning Brush is designed with the DIY homeowner in mind, can withstand vigorous cleaning, and helps keep a chimney and home safe. Made with sturdy, oil-tempered spring wire, this brush will last for a long time and make quick work of chimney cleaning projects. Cleans out soot, creosote, and any other buildup in masonry chimneys to increase efficiency and safety. For best results, choose the brush size that matches the inside measurements of the chimney flue. (Use a poly brush for chimneys with metal flue liners.) This brush has a male 1/4? NPT threaded connector for attaching to rods and pull rings. Use with Rutland item # 10624 (4' rods), 10672 (6' rods), or KRK-18 (18' Kit - includes six 3' rods). Material: Polypropylene.