The 12" Diameter Superior Firestop Thimble is a valuable accessory to your new fireplace system. A firestop provides additional protection at points where the chimney passes through combustible materials, and the thimble assists this key component. Avoid harmful damages that can occur with combustible materials and fire, and simply enjoy your next family evening with a warm, safe fire.

Features:

• Heavy duty material and 8" diameter
• Single pack
• Assists firestop with safety