What is this?These lamp sockets work with E10 bulbs. Great for the equipment on the electrical experiment lab, old flashlight repairing, indicator light or warning light on the distribution box, control panel.What will I get?Product Name: E10 Lamp Socket with BulbColor: BlackMaterial: Plastic CopperBulb Current: 0.3ABulb Voltage: 2.5VBulb Light Color: YellowSocket Mounting Hole Dia.:3.8mm / 0.15"Socket Mounting Hole Distance.:23mm / 0.91"Socket Size: 29.5mmx19.7mm / 1.16&"x0.78"(D*H)Package Content: 10 x Lamp Socket; 20 x BulbAre there any advantages of the product?Made of copper and plastic material, copper has good conductivity.How to use it?Screw the bulb in the lamp socket and connect the socket to the power source with wire.What should I notice?Please check the mounting hole and hole distance before buying.