Circular saw reduction rings - 20mm outside & 16mm inside - 1.8mm thick (DART)
Circular Saw Blade Reducing ring 20mm To 16mm X 1-8mm - Rings to Ensure that Blades fit Safely to your Machine when the Blade bore size is Different
Fits all makes of saw blade
Reducing Ring - 20mm outside & 16mm inside - 1.8mm thick (DART)