, Standard UNSWITCHED B22 (22mm) bayonet cap Lamp Holder with shade ring - suitable for bulbs up to 200W (for SWITCHED B22 version, ElekTek Safety Switch available in separate listing) , Hand assembled - easy to separate for fitting: simply remove the thin upper shade ring by unscrewing anti-clocwise; hold base with the Earth terminal pinched between thumb and index finger and unscrew thicker lower ring by unscrewing anti-clockwise. When re-assembling ENSURE ceramic insert is aligned correctly in base & body alignment slots are aligned with ceramic insert , Internal locking screw mounted in a separate riveted & threaded base ensuring your lighting does not come apart with use (beware of cheaper, pressed type bases that cannot carry a locking screw) - loosen screw, thread onto existing threaded fitting and tighten locking screw before wiring , This 22mm BC (bayonet connector) lamp holder is intended primarily for attachment to a male 10mm or 1/2" threaded tube , WARNING: All metal light fittings must be earthed ,