The WARN Hyperlink Isolators are ideal for securing your Hyperlink Shackle’s. The isolator provides a sturdy attachment, to prevent any dings or dents to the surface of your bumper. The isolator also prevents debris from damaging the pin shaft. Without, the isolator you may find that the Hyperlink Shackle will continue rattling around causing unwanted damage to your bumper. The isolator’s are made of polyurethane and are sold in pairs.