Don't let the diminutive size of the Kuryakyn by Kellermann Atto® fool you. These pint-sized powerhouses make up for their small stature with sheer attention-grabbing brightness. Kellermann's EXtranz® (Extreme Optical Transparency) and HighPower L.E.D. technology with Long Life Protection Guard® significantly increase rider visibility on the road. Extremely small, spectacularly bright. 10 mm diameter x 14 mm length with 7.8 mm lens. Universal for most 12-volt DC applications with M5 x 0.5 x 6.5 mm mounting thread. Amber (front or rear applications): Amber turn signal (2-wire). Functionality options: WL (front applications): White running lights (two-wire). RB (rear applications): Red run-brake, run-turn, or run-turn / brake depending on motorcycle (three-wire).