Bayonet Cap (BC) [B22] to. 2x Edison Screw (ES) [E27]. Light Bulb Splitter Adaptor/Extender/Holder. B22 to 2x E27 adaptor is 74mm high by 74mm wide (22mm bayonet cap to 2x 27mm edison screw). USAGE: This DELIGHTFUL product allows you to use 2 E27 base bulbs in 1 B22 base end fitting light socket, leading to high level of illumination.
eBay