The viking aluminum fairleads are designed to be used with synthetic winch lines, replacing the factory steel roller fairleads. they are made from aluminum that is anodized for increased surface hardness, strength and corrosion resistance. the aluminum fairlead is the traditional replacement of stock roller fairleads, but differs from others with the anodizing, wider guide slot and countersunk flat head stainless steel bolts. they offer high strength, abrasion resistance,heat resistance, and have a smooth surface to protect your synthetic winch line. anodizing makes the material harder reducing the friction between rope and the fairlead, minimizing rope damage from heat and abrasion.