The White Plain E27 Lampholder with Push Wire Terminals comes in 2 parts. The main body and the cap. There are no screw terminals for the wires on this lampholder so your wires must have either a ferrules or be soldered so they can be pushed into the terminals. Please also note that once the wires are pushed in they are not intended to be taken out again.
There is a 10mm thread in the base for fixing to a male thread.
Height is 60mm and diameter is 40mm