Anytime a wire rope is bent so it can be attached to a hanging point, there is a risk that the eye could be crushed. The addition of a wire rope thimble to the eye protects the rope by guiding it into a natural curve and creating an extra layer of support.
This thimbles can be installed inside the steel wire rope loop. They help to protect the cable from pinching and abrading on the inside of the loop. The use of thimbles in loops is industry best practice.