Helix Radiator Fin Straightener The Helix Radiator Fin Straightener is a versatile 6-in-1 tool designed for straightening and cleaning radiator and oil cooler fins. Clearly marked sections help to align various fin sizes, while its compact design ensures it can access confined spaces effortlessly. Features: 6-in-1 straightening and cleaning tool for radiator and oil cooler fins Removable handle for use in the tightest spaces Straightens fin size 8, 9, 10, 12, 14, and 15 fins per inch