Bosch 2609256 B55 Standard Carbide Circular Saw Blade with 24 Teeth – 165 mm in Diameter – 20 mm Bore (16 mm with Reduction Ring) – 1.6 mm Cutting Width - - Amazon.com
299 - Reduction rings for circular saw blade bore 299 | Spare parts and accessories | CMT Orange Tools USA & Canada
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
Reducing rings for circular saw blades - sautershop
Bosch 2609256885 140 mm Circular Saw Blade Special, 40 teeth, bore 20 mm/bore with reduction ring 12.75mm - - Amazon.com