New URL and a metal plate and to give squared the device has an excellent strength is real estate wrinkling or twisting composite having excellent durability, not is a section for door is opened, metal plate (2) the rules bonded ball (4) for connecting with large capacity I/squared (3a, b) the metal plate (2) of ball (4) ball for joining the same having a center hole by four bearings position such as (4) greater than junction ball (5) which piercing rivet to pierce the workpieces, metal plate (2) on both sides of squared (3a, b) passage, and to ensure the sanitary in which each conjugate ball (4, 5) in a state where of the hand to coincide with center of adhesive (6) are filled with a junction is formed inside the tie..