Make trailer or flatbed wiring and testing a snap with the Dumble RV Supplies Electrical Wire Connector Junction Box 1-Pack. The box includes quickly identifiable markings for simple, secure install trailer/towing hook up. Blue – Electric Brake; Brown – R Stop & Turn; Green – Tail & USC; Red – L Stop & Turn; Yellow – Center AUX; Black – 12V Charge Line; White – Ground. It keeps your wiring out of the weather and allows adaptability without compromising splices. Attach your wires properly prior to going into the box and then use the box to rewire. Each of the 7 studs is 10-32 thread and comes with 1 nut per stud. Includes 1 junction box with 7 wire studs, 5 rubber boot grommets, 2 screws, and 2 cable connectors. Warning: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm.