USHIO SPAX Bulb Socket - Lighting Duct Rail Bulb Socket - E17 Base - LED Compatible - Package: Set of 4, Bulbs Not Included. 1. Color: White, Size: 30mm x 30mm (Diameter * Height), Material: Flame-retardant PBT, Compatible Load: Up to 1A/250V. 2. Safety Certification: PSE Safety Standard Certified. High-strength plastic material is used for the plug joints, with a maximum load capacity of approximately 5kg. 3. Adjustable Position: Hook ceiling body for duct rails, can slide freely on the duct rail, and can be adjusted to your preferred position. 4. Easy Installation: Easy to install on the lighting rail, no construction required. 5. Bulbs are not included. #Lighting Duct Rail Socket #Socket Size e-17