Nuki Adapter for the inner part of the lock insert - Keso
Adapter for a cylinder-terminated lock insert that allows the Nuki Smart Lock 2.0 to be compatible with conventional cylinder liners as well. The adapter serves as a connector between the button insert and the Nuki Smart Lock 2.0.
How to find out which Nuki adapter you need
remove the swivel castor from the inside
look at the end of the lock insert and measure the diameter
see the image below to find out which Nuki Adapter you need