Product name: hexagon cap nuts
Thread size: M4x0.7mm, hexagonal width: 7mm/0.27 inch, dome head size: 7x4mm (max diameter x height), height: 8.0mm/0.31 inch
Material: brass with corrosion resistant zinc plated surface to ensure a lifetime of use.
Widely used in mechanical, plumbing, electrical, furniture and fencing projects to cover exposed bolt threads.
Acorn nuts help prevent thread stripping and provide a decorative appearance as finish fasteners against exposed threads.