The 9148 Radius Live End Feed has an integral thread that accepts a standard electrical fitting with a 1/2-14 thread. Available in Matte White or Matte Black finish. The live end is polarized. The polarity tab must point away from the track bead. Not to be used as a support. A separate support for the conduit must be used. UL listed. 2.9 inch width x 1.4 inch depth x .5 inch height.