Galvanized Thimble
Use this galvanized thimble as a sleeve when running a stovepipe through the side of a masonry chimney. Keep its inner end flush with the inside of the flue surface. The thimble is 12" long, meets NFPA 211 standards, cuts easily, and is sized to accommodate 6" or 8" diameter pipe. Inside dimensions are 6 3/16" and 8 3/16" respectively. Do not use a thimble in or around combustible materials.