The Royal Apex Miniature Screw Base Light Bulb is designed for various applications including flashlights, DIY projects, and educational experiments. These incandescent bulbs feature an E10 miniature screw base, making them easy to install by simply unscrewing the flashlight head from the body, removing the retaining collar, and replacing the old bulb. The bulbs are shock and vibration resistant, ensuring durability and reliability. They are commonly used in middle and primary school electrical experiments, old flashlight accessories, DIY popular science equipment in physics teaching, and car light DIY accessories.