Swivels are used in conjunction with blocks, rigging, and furling systems to provide articulation or rotation.
Note: UDL (BL) * - The "Uniformly Distributed Load" breaking load of the shackle, where the load is applied across the full span of the shackle pin. PL (BL) ** - The "Point Load" breaking load of the shackle, where the load is only applied at the center or one side of the shackle pin.