6 Stovepipe Heat Reclaim / Radiator Rings / Bands / Fins 8" Dia. collars capture heat from stove pipe. Fits 25 inch circumference (8 inch dia) stovepipe. 28 ga. steel, 1 1/2 inch wide Reclaim more usable heat from your stovepipe, improve efficiency. Reclaims and radiates heat before it reaches the chimney They pay for themselves in a short period of time. Install in 2 minutes, snap on. They will last a lifetime. They never need maintenance.