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Standard B22 (22mm) bayonet cap fitting, unswitched, with shade ring 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) Maximum assembled, fitted height 48mm This 22mm BC (bayonet connector) lamp holder is intended primarily for attachment to a male 1/2" threaded connector. All metal light fittings must be earthed