Atto (symbol a) is a unit prefix in the metric system denoting a factor of 0.000000000000000001. OK, these turn signals are not that small, but with its 13mm diameter the Atto is so small that the lighting surface fits on a 1 Eurocent coin four times. It uses Extreme Optical Transparency technology, providing spectacularly bright lighting. Also available as a white position light that also can be used as front parking light, as well as a tail/brake combination light. All Atto lights feature a minimalistic M5x6.5 mounting stud and are sold each.

Note: Replacing the stock turn signals with turn signals that draw less Amps, such as LED turn signals, requires the separate purchase of a Load Equalizer or replacement of the stock turn signal relay with an electronic turn signal flasher, such as ZPN237304. CAN-Bus (HD-Link) equipped 2011 to present Softail, 2012-2017 Dyna, 2014 to present Sportster and Touring do not require a Load Equalizer when LED turn signal inserts are used, as the blinking speed can be adjusted. Download instructions from https://zodiac.nl/docs/instructions/CAN_turns.en.pdf