Note: Measurements are approximate and can vary slightly. MAXBrite (Heel-less) - Designed especially for MAXBrite burners to ensure the highest light output. Will also work for any Aladdin heel-less burner, including Models 3-11 and 23A. Aladdin's exclusive borosilicate glass is shatter resistant and can withstand immense heat. All chimneys carefully inspected and are free of bubbles and other defects. It's the finest lamp chimney available, made from the same kind of glass they use in laboratories! Made in China. MAXBrite (Heel-less)-12-1/2"H, 2-5/8" OD base. To install, slip into the spring loaded tabs on top of the burner.