Only for E10 LED lamps. Type: E10 screwed lamp holder with cable. Cable length: 20 cm. Usage: Bulb bases used in old flashlights, experimental science teaching, craft materials, etc. Package contains: 10 E10 bulb holders with cables. Product size: E10 screw lamp holder with cable line. Inner diameter of the lamp holder: 10 mm. Lamp holder outer diameter: 15 mm. Lamp holder height: 23 mm. Cable length: 230 mm. Product information: The bottom of the lamp holder is positive (+). The side of the lamp holder is negative (-). The red wire connects to the bottom of the lamp holder, it is positive (+). The green wire connects to the side of the lamp holder, it is negative (-). This is the E10 base. It is suitable for E10 bulbs. Bulb should not exceed 30 watts. Used in older flashlight accessory sockets and DIY physics teaching science experimental equipment. Package includes: 10 x E10 lamp holders (lamps not included)