Juno Lighting T537WH Trac-Master Low Profile 12V Electronic Transformer, White Transformer adapter may be used with Trac-Master or Trac-Lites Series track Copper alloy contacts provide precise spring action on track Brass, tin-plated electrical contacts housed in nylon jacket provides quick electrical connection to lamp holders Designed to withstand intense heat produced by incandescent track lighting Dimensions: 1-3/8 inches high by 6 inches wide