Hi!
I use (& sell) the Rubit clips. I can tell you the two are very slightly different in size but the medium has a larger "clip" that is easier to use if you have trouble with arthritis, etc. I LOVE Rubits & think everyone who uses harnesses or collars should have at least one.
Small is 22mm (55/64") and medium is 27mm Diameter (1 1/16"). |