LH0405 E26/E27 medium base 2 piece lamp holder/socket with 2 hole mount and screw terminal connections
Diameter 10cm Thickened Large Size E27 Ceiling Lamp Holder Light Bulb Adapter Socket, Hand Tools - Amazon Canada
Leviton 9880 Medium Base, Two-Piece, Keyless, Incandescent, Unglazed Porcelain Lampholder, Surface Mount Low, Single Circuit, Back Wired, White Pack of 1 - Medium Light Socket - Amazon.com