Neil..the blade i have/had is a 200mm blade for my rubi diamante d-200 table saw..and it has a 25.4mm bore so the ring is removed to fit..as the flange ring is for the 22.2mm bore.....
This is the cutter and is the dogs danglies of table saws....expensive but very powerful and reliable.....
D-200 diamante. 
Portable electric tile cutter. For gres, ceramic, glass, tiles,marble and other materials. Table, internal structure and chassis made entirely of stainless steel. Guide to allow repetitive cuts. Adjustable accesories: guide for 45º cuts and guide for 0º to 90ª cuts. Diamond blade Ø 200 mm included. Water refrigeration of the blade. With thermic security switch. Fully removable guard for plunge cutting.