Proper maintenance of your chimney is important for the safety of your home and family because creosote buildup increases the danger of a chimney fire. Chimney maintenance also helps your unit operate more efficiently by eliminating materials that restrict air flow and draw. This AW Perkins rectangular wire chimney brush is for use on masonry chimneys and has a 1/4" point thread. The AW Perkins fireplace brush is available in a variety of sizes so that you have the right tool for just about any job.