Multipurpose die-cast aluminum corner joint for pinning, screwing or crimping with sealant grooves. Originally designed for security (armored) profiles, the Tonale corner joint has also been installed on standard window and door frames with great success. (screws not included). In addition to an improved strength, this bracket combines different interesting features, the most important being the lateral expansion which avoids deformation and eliminates any play. Internal or external tightening possible. It has specific sealant grooves to guarantee excellent sealing and greater strength while avoiding any waste or spill. Ideal for window producers and distributors, that can use just one bracket instead of three. Tools needed: Allen wrench or crimping machine or pinning machine.