What machine you are using and what bore size does it have. The following size diameter blades use the following bore sizes on the most common machines.
Blade Diameter / Bore Size
4” (100mm) = 16mm
4.5” – 9” (115-230mm) = 22.23mm
12” (300-305mm) = 20mm
This table should only be used as a basic guide. If you are unsure of the correct bore size you should refer to the machines operator manual of your machine.