Single Flare Tool 37 Degree AF98-2007Single Flare Tool 37 Degree1 8" to 3 4" tube AF98 2007 98 2007 The Aeroflow hand held brake flaring tool is the fastest way to get a professional single flare while the hard line is still installed into the car and in hard to access areas on vehicles or onsite. This 45 degree or 37 degree flaring tool is great for both brake lines and AN tube nuts and sleeves. This tool will work with 3. 17mm (1 8) tubing right through to 19. 05mm (3 4).