There are two different angles used in flare tool world. One is 45 degrees and the other 37 degrees. The "detailed" instructions did not detail this very important detail. So now I will return it for a refund because there's no way of knowing how many degrees the flare is. Otherwise the hydraulic lines will leak if the angles don't match.
Performance Tool Double Flare Tool is not recommended by AnineThailand
Flares thin wall copper, steel & aluminum tubes. For both single & double flares. 7 pc. set w/flaring bar, yoke & 5 double flare dies for various tubing sizes. Hex nut locking for precision flaring.