Kuryakyn by Kellermann Atto Turn Signal If you are looking for the smallest turn signals with the maximum brightness, look no further than the Kellermann Atto. The unique design can be mounted nearly anywhere utilizing the M5 threaded post and included nut. Brackets are available to mount the Attos on your stock HD hand controls and fender struts. Kellermann's EXtranz (Extreme Optical Transparency) and High Power LED technology with Long Life Protection Guard, significantly increases rider visibility on the road. Features: IC controlled (integrated circuit), 330 kHz, for max LED lifespan and brightness High quality metal housing Durable glass lens 10mm diameter x 14mm length with 7.8mm lens Universal for most 12-volt DC applications with M5 x 0.5 x 6.5mm mounting thread Not Dot/Fmvss 108 compliant Sold each