

🔥 Seal the gap, stop the flame – safety that speaks volumes!
The Hilti Firestop Block CFS-BL is a precision-engineered firestop solution designed to protect electrical outlet and switch boxes in fire-resistive walls. Measuring approximately 8" x 5¼", it features moldable firestop putty that effectively blocks flames, smoke, and toxic gases. Suitable for both commercial and residential applications, this lightweight yet durable block ensures compliance with fire safety standards, backed by Hilti’s trusted brand reputation.
| Material | Multiple |
| Head Style | Hex |
| Fastener Type | Hexagon Bolt |
| Brand | HILTI |
| Thread Type | UNF |
| Thread Style | Right Hand |
| Item Hardness | Grade 5 |
| Head Type | Hex |
| Number of Pieces | 1 |
| Manufacturer | Hilti |
| Model number | CFS-BL |
| Item Weight | 354 g |
| Product Dimensions | 13.67 x 20.02 x 5.08 cm; 353.8 g |
| Item model number | CFS-BL |
| Item Height | 2 Inches |
| Item Width | 7.88 Inches |
| Are batteries included? | No |
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