ITEM NAME:Black Period Style Screw E27 Light Bulb Lamp Holder Pendant SockWGBX Specification: Rated current: 4(A) Rated voltage: 250(V) Material: metal + heat resistant plastic Edison Screw 27mm screw socket. Lamp holder dimensions are 54mm high by 56mm wide; and has an 10mm screw mounting thread. It has a 40mm ring thread with lamp shade collar that can be removed to allow the fitting of a lamp shade. Package Included:.1x E27 Light Bulb Lamp Holder Pendant Socket. Edison Screw 27mm screw socket. It has a 40mm ring thread with lamp shade collar that can be removed to allow the fitting of a lamp shade.