This Trailer Sidemarker light features 2 Bright Incandescent Bulbs that shine through the Amber Plastic Housing giving you an effective Sidemarker or Clearance Light for your Utility or Enclosed Trailer. The Amber Side Marker Trailer Light Measures 4" x 2" and is a surface mount design. The Mounting holes are spaced 3" apart center to center, but hardware is not included. The Durable ABS Lens is removable and snaps on or off so you can replace the bulbs inside, which are size 194 Bulbs. The thing that sets this particular side marker light aside from other Incandescent lights is that it uses 2 bulbs instead of 1, allowing it to emit a brighter light in the same amount of space. The light has a single power wire and grounds through the mounting hardware (not included).This Oblong Trailer Clearance and Siremarker light is DOT approved and rated for 15,000 hours.Features:- Amber incandescent Sidemarker/Clearance Light- 4" x 2" Oblong / Oval- Surface Mount (3 inch center to center)- Hardware not included