Attaches to drain rods for removing stubborn dirt and debris from flue & chimney walls. Ideal for regular chimney maintenance. Compatible with Silverline Drain Rod Sets and most third party sets. Brush diameter: Brush diameter: 250mm. Attaches to drain rods for removing stubborn dirt and debris from flue & chimney walls. Ideal for regular chimney maintenance. Compatible with Silverline Drain Rod Sets and most third party sets. Brush diameter: Brush diameter: 250mm.