Hillman 5/16 in. x 5-1/2 in. Zinc-Plated Steel Carriage Bolt, 50-Pack R-13 Roll Insulation the head design allows easy

the head design allows easy countersinking for a flush finish

the square neck locks into wood to prevent spinning

Q: What are the plank dimensions

R‑15 performance—add to cart and start insulating today

I love pairing them with natural woods

Hillman 5/16 in. x 5-1/2 in. Zinc-Plated Steel Carriage Bolt, 50-Pack R-13 Roll Insulation the head design allows easy5 16 in. x 5 1 2 in. Zinc Plated Carriage Bolts (50 Pack) Heavy duty zinc plated steel carriage bolts designed for secure fastening in wood and metal projects. The 5 16 in. diameter and 5 1 2 in. length provide strong hold and corrosion resistance for indoor and outdoor applications. Key Features: Durable Construction: Zinc plated steel resists rust and corrosion for long lasting performance Secure Grip: Square neck locks into wood to prevent bolt