Current Spiral Duct Brush 3 1/2 Duct 08000-300 Flat steel bristles spiraled onto heavy duty wire spindle with a Pulling Eye on one end only. This product will quickly remove grit or light dirt within the conduit before installing your cable. Nominal Conduit Size: 3" Made in the USA" Current Spiral Duct Brush 3" Duct 08000-300