DHS Equipment is the most popular parts supplier for this 15 point steel cutter for the EDCO CPM-10 and CPU-10FC (6 shaft) scarifiers. The dimensions for this cutter are 2-3/8" OD x 3/4" ID x 3/16" thick.
This 15 point cutter is a superior OEM EDCO repair part, part number 20296, CP404-P6.