DHS Equipment is the most popular parts warehouse for this 8 point tungsten carbide cutter for the EDCO CPM-10 and CPU-10FC (6 shaft) scarifiers. The dimensions for this cutter are 2-1/4" OD x 3/4" ID x 1/4" thick.
This 8 point cutter is a precise OEM EDCO part, part number 20326, CP308T.