High-Output Chip-On-Board (C.O.B.) technology for maximum visibility Switchback technology provides red running and brake light with amber turn signal Smaller than a US Nickel True flush-mounted Self-contained Waterproof CNC-machined billet aluminum bodies contain internal circuitry, so no additional load equalizer is required Includes fasteners (1 pressure nut and 1 lock nut). BRAKE AND TURN SIGNAL THUNDER BOLT BLK