Working on a project where you want to protect bolt ends or just make things look cleaner and safer? These uxcell plastic nut covers are a simple, effective solution. You get a bulk pack of 100 black caps, perfect for having plenty on hand for workshops, automotive use, or outdoor furniture. They're designed to fit snugly over standard M12 hexagonal nuts (the hex socket inside is 19mm wide). Each cap measures about 24mm in diameter and 21.5mm tall, providing a smooth, dome-shaped cover. Made from sturdy PP plastic, they're durable, have a smooth surface, and won't crack easily. They simply press on over your nuts to shield them from rust, corrosion, dirt, and moisture, which can really extend the life of your fasteners. They also prevent accidental scrapes or snags on exposed bolt threads. Installation and removal couldn't be easier – no tools needed. A cheap and smart way to give your metalwork a more finished, professional look while adding a layer of protection.