24.5mm diameter 15mm thick. These buttons will fit any press fit spinner that can accomodate 24.5mm buttons including our Monolithic, Monolith, Minilithic, Minilith as well as models from many other makers. They are designed by Dark EDC. Machined and finished here in the USA by Nick McEntee of Full Throttle Originals. They are the buttons in the center in the photos seen here.