Juno Lighting Group R731WH Trac-Lites Gimbal Low Voltage MR16 Lamp Holder with 12V Electronic Transformer, White Height: 5-1/4-Inch, Width: 4-3/4-Inch Ceramic socket uses one 12-Volt, 20-75-Watt MR16 bi-pin lamp Copper alloy contacts provide precise spring action - no arcing, will not take a set and pulls to up position for two-circuit application Polycarbonate transformer housing holds the painted formed steel lamp housing on a swivel arm 90-Degree vertical aiming capability and 358-Degree rotation