Robinair 18403 Fin Straightener Robinair's Fin Straightener tool, with 12 different fin spacing options, is ideal for cleaning and straightening a variety of home and auto finned applications like: condensers, evaporators, and more Compact design fits into tight, confined spaces: durable nylon straightener heads are only 3-1/8 inches in diameter; ribbed plastic handle is only 3-1/2 inches long Includes two interchangeable comb heads featuring 6 clearly marked comb sizes (in fins per inch) per head for a total of 12 - enough fin straightening options to fit almost any situation Comb head #1: 8, 9, 10, 12, 14, and 15 fins per inch Comb head #2: 10.5, 11, 13, 18, 20, and 22 fins per inch