Original black/grey plastic charger key, as supplied with most Hostmaster MK. 3 models from the early 70's onwards.   (Also fits most Sparklets models from around 1920 through to 1981, when Sparklets manufacturing ceased in the UK.  This includes the glass bodied Types C and D, early and late Streamline models, Hostmaster Mks. 1, 2 and 3 and Aquarius models.)   This item does feature a tool to remove the neck sleeves in the Hostmaster Mk. 3 and Aquarius but it does not work for other models (such as the Hostmaster Mk. 1 and 2 models and Globemaster ).