This nut is Zinc Plated as an added layer of protection to prevent rust. The nut features a nylon insert that “locks” the nut in place, which protects the nut from “backing off” due to vibrations, which Harley's are known for. SOLD INDIVIDUALLY Fits 2004-2022 Harley Sportster 883 XL & 1200 XL Models (Except RH/S 975/1250cc Sportster) Replaces HD Pt# 7804