Kit allows for both new and retrofit data and telecom cable firestop installations. Ideal for high traffic cable penetrations. 3M(TM) Fire Barrier Putty Sleeve Kit DT 100 with 1 diameter x 12 length sleeve (25.4 mm x 304.8 mm). Can be used as a one-piece sleeve or the sleeve may be split/hinged for existing cable installations. The sleeves can be easily installed in openings that are either tight to the sleeve or irregular. Can accommodate oversized openings (up to a one-inch larger diameter than the 3M(TM) Fire Barrier Putty Sleeve diameter).