This lampholder is a standard B22 | BC | Bayonet Cap lampholder except it has a lock collar at the bottom with an internal locking screw.
This prevents any unwanted untwisting of the lampholder.
Lamp Cap: BC | B22 | Bayonet Cap
Min Shade Hole Size: 26mm
Max Shade Hole Size: 32mm
Max Wattage: 60W
Finish: Copper Plated
This Lampholder must be wired with a 3 core flex that provides the correct earth connection.