Amazon.com: 10" x3T Steel Brush Cutter Blade for 1" (25.4 mm Or 20 mm Arbor), Carbon Steel Weed Eater Blades with Blade Adapter Attachment Kit Compatible with Hus-qvarna, Sti-hl, Ore-gon, and Hita-chi :
ECHO 8 in. 8-Tooth Brush Blade Conversion Kit (20 mm) 99944200422 - The Home Depot
ECHO Brush Blade Conversion Kit for SRM Trimmers 8 in. 8-Tooth Cutter (20 mm)a | eBay