This square wire chimney brush measures 12 in. x 12 in. and will take of care of some of the toughest buildup of soot and creosote that has built up on the inside of your chimney, which eventually could become a possible fire hazard. This brush is designed to be used in masonry chimneys, and features a 1/4 in. point thread and is available in a variety of sizes. Using this chimney brush will not only reduce buildup in your chimney, it will save you money by not having to have this important job hired out by a professional chimney sweep.