Tap In Ferrule 1/2 Inch (13mm) The Lighting Centre NZ

Plastic Ferrule to tap into table or floor wooden stand, attaches to 13mm / 1/2″ lampholders
Drill an 11-12mm hole depending on hardness of wood
Some UHU or PVA can help to keep it in place once set

Diameter: 13mm / 1/2 Inch
Height: 35mm