Specification: This product is mainly used in photography, an adapter for studio daylight bulbs. It allows 3, 4, 5 bulbs installed in one single socket at the same time. It is E27 base, same fit as regular household bulb socket. Suitable for: Home and studio daylight bulbs in photographic use. Type: Bulb Base Adapter Material: PC Voltage: 85 - 285V 3 Heads Size: 15.8cm x 10cm/6.22" x 3.94" (Approx.) 4 Heads Size: 13.5cm x 10cm/5.31" x 3.94" (Approx.) 5 Heads Size: 11.5cm x 9.8cm/4.53" x 3.86" (Approx.) Note: Due to differences in lighting and screen settings, the color of the project may be slightly different from the picture. Due to different manual measurements,allow for slight size differences. Package Includes: 1 x Bulb Base Adapter