This screw-type lamp holder and bulb set is designed to facilitate a wide range of electrical experiments. Suitable for both series and parallel circuits, it offers a practical and engaging way to learn about electricity. Ideal for educational settings, this set helps users develop a solid understanding of electrical principles through hands-on activities. Features -Color:Black -Material:Plastic, copper -Size:7.50X3.50X2.60cm/2.95X1.38X1.02in -Easy installation: the screw socket design makes an easy and quick installation process, making it accessible for all users -Brightness adjustment: the electrical circuit design allows for adjustable bulb brightness, providing versatile lighting options for different scenarios -Energy efficient: the circuit design is optimized to save energy, reducing power consumption and promoting usage - build: made from plastic and copper, this product is built to last, ensuring longterm durability and resistance to wear and tear -Wide application: suitable for electronic toys, breadboard power supplies, school laboratories, and technical design courses, this product is versatile for numerous projects Package list: 4 x screw lamp holder