Even if they are unforgivable elements in providing required connection between panels at both sides of curtain-column and beams forms they take place at various applications according to requirements of froms and the desire of user. Due to its special structure with worm screw wringing and to dismantling operations are very quick. The are less disturbed than environmental contamination such as cement grout in comparison with Standard tie-rots. They are easy to care and have longer lifetime. They are manufactured at tensile strengths of 12 ton and 15 ton.