Juno Lighting Group T538BL LMS 30K HD 120 RPC WL BZ Light, Black Height: 1-3/4-Inch, Width: 5-1/8-Inch Transformer adapter may be used with track-Master or track-Lites Series trackk (or designated monopoints) and designated low voltage lamp holders Copper alloy contacts provide precise spring action on trackk - no arcing, will not take a set and pulls to up position for two-circuit application Brass, tin-plated electrical contacts housed in nylon jacket provides quick electrical connection to lamp holders Designed to withstand the intense heat produced by incandescent trackk lighting