Only for E10 LED lamps. Type: E10 screw lamp holder with cable. Cable length: 230 mm. Usage: Suitable for use in older flashlights, science education experiments, craft projects, and DIY applications. Package includes: 10 x E10 bulb holders with cables (lamps not included). Product dimensions: E10 screw lamp holder with cable. Lamp holder inner diameter: 10 mm. Lamp holder outer diameter: 15 mm. Lamp holder height: 23 mm. Cable length: 230 mm. Electrical information: The bottom contact of the lamp holder is positive (+). The side contact of the lamp holder is negative (-). Red wire connects to the bottom (positive +). Green wire connects to the side (negative -). Compatibility: Designed for E10 base LED lamps only. Bulbs used must not exceed 30 watts. Ideal for use in older flashlight accessory sockets and educational science experiment equipment.