English 
A swivel (rotation compensator) is a connecting mechanism that allows two parts attached to it to rotate around their axis. Prevents twisting of the cable or rope, thereby relieving unnecessary loads. Swivels are used as a connecting link between the load and the lifting mechanism.
Often a swivel is an integral part of other lifting devices (hook swivel block with swivel, carabiner with swivel, ring with swivel), providing them with additional function of protection against twisting of the cables.
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