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Standard B22 (22mm) bayonet cap fitting, unswitched, with shade ring - suitable for bulbs up to 200W 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 53mm Back-Plate diameter 25mm, cover diameter 27mm Cover is secured when you screw down the lamp holder base. All metal light fittings must be earthed