Enhance your caulking projects with this high-quality backer rod, perfect for ensuring a smooth and even application. Ideal for driveways and sidewalks, this 5/8 inch by 20-foot rod acts as a reliable filler that prevents caulk from sinking and cracking over time. Made from durable gray polyethylene, it is designed to withstand various weather conditions while providing long-lasting support to your sealing tasks.