TruFast 4.5' PMF Fastener (250 EA) White Plastic Heavy-Duty Insulation Anchors for Securing on Masonry, Brick, Concrete, and Stone Walls

No screws, adhesives, or metal pins are needed. A single solid plastic design prevents thermal bridging. Simple installation: pre-drill with a 5/16' masonry drill bit and hammer it flush. The large 2-3/8' washer head securely fastens insulation. For insulation thickness from 1' to 5'