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MR16 Halogen Lamp Socket mini bi-pin 12V ceramic lamp holder
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Ceramic Cable R7s Halogen Lamp Holder, For Electrical Fitting, Base Type: E40
Square Socket for 6V 20W - 30W Halogen Bulb – Atlanta Microscope Service
What's the lamp bulb holder?
G9 Base Ceramic Lamp Holder Socket, M10 Entry Base | Mullan Lighting