The invention relates to a shackle that is meant to be fastened at an end of a boom structure that is to be used by a working machine, in order to couple therewith one or more organs, such as a rotator, a grip loader and/or the like, to be driven by power transmission transmitted from a hydraulic system of the working machine. The shackle has as a frame structure that rotates around two axes of rotation (x, y) perpendicular to each other and that is to be fastened by its opposite ends in longitudinal direction (s) to the boom structure and to the organ, and an actuator arrangement (2) that is driven by auxiliary power, advantageously operating by transmission of the working machine's hydraulic system, for dampening/locking of the shackle's swinging and for releasing the same to rotate around its axes of rotation. The shackle's (RP) actuator arrangement (2) is arranged to dampen/lock and to release the rotation of in respect with each other separate frame parts (1a, 1b) of the shackle by changing a mutual distance (e) of the shackle's axes of rotation (x, y).
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