The 2 1/2 Diamond Coated Cast Saw Blade (#7310) measures 64 mm diameter.
The 3 1/6" Diamond Coated Cast Saw Blade (#7320) measures 80 mm diameter.
All the DeSoutter cast saw blades have "easy fit" pentagon mounting hole. Each circular blade can be rotated up to five times to maximize their useful life and reduce cast saw consumable costs.