There are 3 basic types of flared ends you are likely to see on most cars: The single flare typically used on lower pressure fuel lines fittings, the double flare used on the high pressure brake lines of most vintage cars, and the bubble flare used on most modern and many older imported cars. In the picture the single flare is on the right, the double in the middle and the bubble on the left. With the proper Eastwood tools it is easy to make any of these flares.