** DO NOT USE THIS THIMBLE IN OR AROUND COMBUSTIBLE MATERIALS. BRICK AND MORTAR ONLY **
Use this galvanized thimble as a sleve when running stovepipe through the side of a masonry chimney. Keep its inner end f;ush with the inside of the flue surface. The thimble is 12" long, meets NFPA 211 standardsis sized for 6" or 8" application, and cuts easily. Inside dimensions are 6 3/16" & 8 3/16" respectively.