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Wire rope will have a minimum safe bending radius and there will be a matching thimble for each specific diameter wire rope.

If a connection is made to a hole in a tang, the sharp (or not sharp) edge of the hole will cause the wire rope to kink or otherwise bend below the recommended minimum radius.

If the wire rope is placed under tension, the outer wires composing the rope will have greater stress and are more likely to break, while the inner wires (relative to the bend) will have a more forceful contact with the hole in the tang.

One can get away without thimbles, for example, if one is passing the wire rope around a pipe or similar cylinder with a radius greater than the minimum recommended for that particular wire rope.