Sorry for make you misunderstand, their diameter range is 2.5 - 4.5 mm.
I saw your catalog, RT 7-5.0 3/4 and RT 7-5.0 4/3 can work with diameter 3 - 5 mm. which is not cover.
So please recommend the equipment that can work with diameter 2.5 - 4.5 mm (2 axis include connector )