Micromark Orbital Low Voltage 12 Volt Track Fittings White MM31367 from £10

50 Watt MR16 Max Bulb.  Track Fittings. FOR USE WITH 

( 12 VOLT ) Low Voltage MICROMARK TRACK.

Orbital Low Voltage Track Spot. Size: (LxWxH) 110x60x120mm.
Lamp: MR16 sealed dichroic (max 50W). MM31367

ps have other bits of this type like track ...