This screw-type mini lamp holder is an essential tool for middle school physics experiments, designed to demonstrate the principles of electrical circuits. Its compact size allows for easy integration into various learning setups. Features -Color:Multi -Material:Plastic -Size:7.50X3.50X2.50cm/2.95X1.38X0.98in -Easy to use: the screw lamp holder is designed for simplicity, making it easy to light up small bulbs in series for middle school physics experiments -Safety: ensuring safety and reliability during experiments, providing peace of mind for users - Practical: using the screw lamp holder can significantly enhancing efficiency in learning settings -Versatile: ideal for middle physics experiments, this product is also suitable for diy projects -Plastic material: made from plastic, the screw lamp holder ensuring long-term use without easy damage Package list: 2 x physics experiment bulb Holders