B&P Lamp 2 5/8" X 10" Chimney, 3/4 Frost 2 5/8 inch base by 10 inch height and 3 5/8 inch bulge Frosted chimney Fits Rayo and Central Draft Lamps Borosilicate Glass All glass chimneys will vary in thickness due to the manufacturing process. They will fit the holder/burner specified in their description.