BORE REDUCTION RINGS FOR CIRCULAR SAW BLADES – Woodline USA
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
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
4Pcs Set Circular Saw Ring For Circular Saw Blade Reduction Ring Conversion Ring - Walmart.com
16mm to 50mm Circular Saw Blade Reduction Ring Bore Bushes for Saw Blade Bores | eBay