The EK clutch is a special version of the E clutch. It was specially developed for bikes with very short dropouts (10-12mm). The length of the dropout must not be less than 10mm, from a length of 12mm please use the E-clutch with the polygons as anti-twist protection.
KU.02.000.15, Weber coupling EK, for short dropouts, smaller than 10 mm.suitable for quick-release axles