This BC | B22 | Bayonet Cap lampholder has a snap on cap and not a screwed cap, this means that once you have connected the lampholder it cannot be untwisted by accident.
This lampholder also has push fit terminals so you will need to ensure you have soldered ends of are using ferrule's and not multi strand cable.
Has a 10mm threaded entry so can get fixed to any male 10mm thread with a 1mm pitch.
You can attach a shade onto this lampholder.
Cap thread: M10 x 1mm Pitch
Cap Style: Snap on
Lampholder type: BC | B22 | Bayonet cap