Today we are going to take a look at Optronics Round Marker Clearance Light with red LEDs, part number MCL-50CRK. This is a clearance or side marker light that is designed to flush mount against your trailer using this rubber grommet. Inside are 3 LEDs that are red in color with a clear lens on the outside. The light is also sealed and waterproofed. It comes with this 2 wire pig tail harness that… see more >