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: 10MM Lamp holder outer diameter: 15MM Lamp holder height: 23MM Cable length: 230MM Product information The bottom of the lamp holder is positiveand. The side of the lamp holder is negative -. Product information The red wire connects to the bottom of the lamp holder, it is positiveand. The green wire connects to the side of the lamp holder, it is negative -. For E10 LED lamps only This is the E10 base. It is suitable for E10 bulbs. Bulb should not exceed 30 watts. Used in older flashlight accessory sockets, the DIY physics teaching science experimental equipment.etc... Package includes: 10 x stand E10 lamp (lamps not included)