Always use Malco Brand Staples for Superior Strength! FBSN1- 1-1/2" (38.1 mm) staples are designed for 1" (25.4 mm) foam board. FBSN2- Additional barbs on 2-1/2" (63.5 mm) staples "Double the Holding Power" in 2" (50.8 mm) foam board. Stapler and Staples (FBSN, FBSN1 & FBSN2) are compatible with most other popular brands of foam board stapling systems.
The Extra Sharp Dual-Barbed 1-1/2" Foamboard Staples (FBSN1) increase holding power to secure PEX to foamboard insulation. The FBSN1 are designed for 1" foamboard. Staples are compatible with moth other popular brands of foamboard stapling systems.