Figure 4: (a) 1st (anterior) engaging round hook prepared in one guide wire. (b) OCRS in its rest position. Although the initial length of the open coil was 18 mm, in final configuration, it is compressed to 14 mm; that is, at rest position of OCRS, open coil is shortened by compression of 4 mm than the original taken length. Total recommended length of OCRS at rest position (distance between two engaging hooks) is about 17 mm.