Put the corner key into the 45 aluninum alloy window profile, move the bump folks, squeeze the two windowprofile tightly and make a 90 angle firmly. You can adjust the machine to 1-side-four-point crimpingaccording to the characteristic of the gusset. Because of enlarging the size and the crimping force, it is anideal choice for the corner crimping of thermal-break door, window profiles and extremely thick curtain wallmaterials.