3M Fire Barrier Block: 2 3/8 in Ht, 5 1/8 in Wd, 7 7/8 in Lg, Up to 2 hr, 12 PK - 413W16|B258 - Grainger
LIGNATUR & Hilti fire partitions, fire protection in timber construction
Hilti - CFS-BL firestop block is suitable for sealing single or multiple penetrations in small to large openings. It is the solution for both permanent or temporary applications and highly flexible for
HOW TO install Hilti CFS-BL firestop blocks for cable tray penetrations - UL - YouTube