16 LED TOWING HITCH COVER BRAKE LIGHT W/20FT WIRE & ADAPTOR KIT 4 2" RECIEVER Perfect protection for your trailer hitch  § Built-in brake light provides added safety when your hitch is not in use  § Foam lining ensures a snug fit  § Fits all 2" trailer hitch receivers  § 16 bright LED lights last much longer than regular bulbs  § 1/2" thick gasket ensures a snug fit  Overall dimensions: 3-1/4" square x 4-3/8" L  5/8" hole for hitch pin (pin Not Included)  12" wire with flat 4 pin trailer connector  20ft Wire /Adaptor Kit These adapters have flat pins and they are available in both car and trailer end configurations. The wire is tapped into the backup lights to disengage the trailer's brakes when the vehicle is reversing. The 7-way RV and 4-flat configuration is a Ready Connect car end connector