This is a bulb holder base for screw-in bulbs with E10 mount used in flashlights, bicycle lights, etc. The socket is an educational element for use in various types of school work and tests. Powered by low voltage up to 24V. We have installed 4mm banana posts to facilitate easy and quick connections to your experimental circuits. Perfect for the basic battery circuit and lamp experiment. The physics experiment light bulb holder (black) is a typical circuit accessory used in middle and high school logistics laboratories, used for installing small light bulbs and conducting series parallel circuit experiments. Technical data:Base dimensions: 31x69mm Height: 23.5mm Max voltage: 24V Connectors: 4mm Banana Sockets https://elecena.pl/product/29429818/e10-educational-bulb-holder-with-4mm-banana-posts 2025-10-15 https://elecena.pl/product/29429818/e10-educational-bulb-holder-with-4mm-banana-posts 2025-10-29