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.Specifications:Material: Flame retardant PCProduct Color: WhiteBase type: E27 basePower: 85V-285VSize:3 in 1 : 95*158 mm   4 in 1 : 95*178 mm      5 in 1 : 95*170 mmPackage Includes:1*  bulb socket