Our double stem double spiral flue brushes are for the tougher cleaning or deburring jobs that the manual series will not handle. (If your job requires a manual flue brush, see our complete tube and flue brush portfolio.) This flue brush handle features heavy duty 4 wire construction which will readily chuck into a power tool. Using large diameter fill wire will result in stiffer cleaning action. More bristle in this size means flue brushes will last longer. The brush should be firmly chucked into a suitable holder at all times. Always wear eye protection and follow safety guidelines supplied with power-driven flue brushes.