Screw-on bottle caps are closures designed to fit securely on bottles, allowing for easy opening and resealing. They typically feature a threaded design that matches the bottle's neck, ensuring a tight seal to prevent leaks and maintain freshness. These caps are commonly used for various types of containers, including plastic and glass bottles for beverages, sauces, and personal care products. Made from materials like plastic or metal, screw-on caps are convenient and user-friendly. They can be easily twisted on and off, making them suitable for people of all ages. Additionally, some screw-on caps come with built-in features, such as child safety locks or pour spouts, enhancing their functionality.