This is a standard BC | B22 lampholder with a 10mm threaded entry, ideal for adding onto copper pipe work.
Comes with a shade ring so you can fit a 29-29mm hole shade onto this copper lampholder.
Please note this lampholder needs to be earthed as it is metal.
Thread: M10 x 1mm
Cap type: BC | B22 | Bayonet cap
Max wattage: 60w