Square MR16 3 Head Track Light features a White, Brushed Nickel, or Black finish and is for use on Halo Track, sold separately. Head adjusts to direct light. Three 50 watt, 120 volt MR16 type GU10 base halogen bulbs are required, but not included. UL listed. Each head is 3.75 inch width x 2.25 inch height x 6.5 inch depth. Complete light is 48 inches in length.