This is Knobbles and Bobbles' pretty pair of taupe/grey star patterned ceramic mortice knobs, they are definitely brown grey rather than black grey stars. Sort of mushroomish - ask me for extra pictures if that would help! The diameter of these knobs is 6cm and they are supplied with the metal connecting rod needed to join the knobs through a mortice mechanism. If you have any questions, please contact us at firstname.lastname@example.org.
None of our mortice knobs are compatible with rim locks, sorry.