The screw-type lamp holder and bulb set is crafted to facilitate various electrical experiments. Its design supports both series and parallel circuits, providing a comprehensive understanding of electrical principles. This set is Suit for students and hobbyists looking to explore of electricity and circuit design. Features -Color:Black -Material:Plastic, copper -Size:7.50X3.50X2.60cm/2.95X1.38X1.02in -Userfriendly design: the screw socket design makes installation straightforward, suitable for both beginners and experienced users -lighting: with an adjustable brightness feature, the electrical circuit design allows you to set the Suit lighting level for any occasion -Safe: designed to be energyefficient, this product helps reduce electricity consumption, making it an choice -construction: constructed from plastic and copper materials, this product is designed to withstand prolonged use without damage -Educational value: Suit for use in school labs and technical courses, this product in teaching and constructing various electronic projects Package list: 4 x screw lamp holder