3M™ fire barrier putty sleeve kits DT 100, DT 200 and DT 400 are designed to help prevent the passage of fire and smoke in new or existing cable penetrations through walls or floors. Each kit comes complete in a box containing a 3M™ fire barrier putty sleeve (two-part metallic sleeve with set of two part metallic flanges), 3M™ fire barrier moldable Putty+, sheet metal screws, drywall screws and two installation identification labels. These kits 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. The oversized openings can accommodate up to a one-inch larger diameter than the 3M™ fire barrier putty sleeve diameter.