Acorn cap nuts are used to cover threaded fasteners that protrude and are, therefore, unsightly or a safety hazard. They protect screws and bolts from stripping. Acorn nuts are found on swing sets, children's playthings, bicycles and more. Acorn Nuts are also ideal as decorative fasteners to conceal threaded studs on cars, motorcycles, boats, RV's, etc. Zinc plated fasteners have good corrosion resistant qualities and are a good choice for indoor, outdoor and industrial applications. Nickel plating provides high resistance to corrosion and does not flake or chip.