This adapter allows 12V MR-16 reflector lamps and halogen bi-pin lamps to be used in any standard medium-base socket powered by 12Vs. Lamps plug into holes in adapter. A tight friction fit allows adapter to be used safely with lamp pointing downward.
GX5.3 to Medium Base Adapter 
This adapter allows 12V MR-16 reflector lamps and halogen bi-pin lamps to be used in any standard medium-base socket powered by 12Vs. Lamps plug into holes in adapter. A tight friction fit allows adapter to be used safely with lamp pointing downward.