5pcs Set Circular Saw Ring For Circular Saw Blade Reduction Ring Conversion Ring Ecoflow Tools Dremel Festool Metabo Bit Holder | Fruugo US
Bosch Professional Reduction Ring for Circular Saw Blades (Reduction from 15 to 12.7 mm, thickness 0.55 mm, accessories for circular saws) - - Amazon.com
299 - Reduction rings for circular saw blade bore 299 | Spare parts and accessories | CMT Orange Tools USA & Canada
SagaSave Circular Reducing Rings for TCT Saw Blades to Reduce the Centre Bore Smooth Version/Gear Version - Walmart.com