POLISI 6-pack MR16 to GU10 to MR16 converter adapter MR16 to GU10 Light Bulb Base Adapters/converter to Utilize GU10 Base Bulbs in a MR16 Socket Convert GU10 Base Bulbs in a MR16 Socket, Pins Spacing 5.3mm package: including 6 pieces make your bulbs to fit standard socket