B&P Lamp 2 1/2" X 7 1/2" Chimney, Clear 2 1/2 inch fitter by 7 1/2 inch height with 3 9/16 inch bulge, clear chimney. Fits #1 size burners and 2 5/8 inch galleries All glass chimneys will vary in thickness due to the manufacturing process. They will fit the holder/burner specified in their description.