Ready Firestop Grommet; Two-piece split cable grommet for single or multiple cable penetrations up to 0.53 in. (14 mm) diameter 10; 10 pack Ready Firestop Grommets are designed to permanently seal small cable penetrations through dry wall. Ready Firestop Grommets are a molded, two-piece grommet with an integral fire and smoke sealing foam membrane for sealing small cable penetrations through framed wall assemblies. Grommet snaps together around cable and locks tightly into the wall. One or more cables with total O.D. up to 0.27" (7 mm) for RFG1 or 0.53" (14 mm) for RFG2 Easy firestop and smoke seal for a small cable penetrations through fire-rated walls For use in gypsum board wall (i.e. drywall) construction Tested to ASTM E814/UL1479 and CAN/ULC-S115 Made from tough, plenum-grade plastic