Due to the revised key adapter the Nuki Smart Lock 2.0 is also compatible with common knob cylinders. The adapter serves as connecting piece between the knob cylinder and your Smart Lock 2.0. In the next step select the manufacturer of your cylinder to add the matching adapter for your knob cylinder. The manufacturer of the cylinder (e.g. EVVA, CISA, KESO etc.) can often be found on the outside of your door. The matrix shown gives you an overview of the shape your adapter can have.