Amazingly small and super bright 3-1 (Run-Turn-Brake) rear indicators Engineered in Germany with SMD-LED technology Die-cast housing with 8 mm (M8) thread Tinted glass with 0.4" (11 mm) diameter For use on HD Softail, Dyna and Sportster fender struts we recommend to use Kodlin Turn Signal Adapters part #s 2020-1923 or 2020-1924. Some applications may require the use of a load equalizer. Universal fit on 12 volt applications.. LIGHT TSIG NEO SMTH BLK