They are designed to achieve a permanent joining of two wire ropes or to terminate with an eye the same wire by swaging on a hydraulic press.
ferrule swaged
The main feature of these ferrules is that they allow the splicing of the wire rope eye and swaging it under the sleeve, to prevent the wire from becoming un-plaited.
We are using this type of ferrules to swag Flemish Eye slings and thus achieving working loads limits higher than swaging using aluminum sleeves.