Amazon.com: OD2-1/10'' x ID 1/2'' Bench Grinder Arbor Washer/Flange for Grinding/Wire Wheel,2SETS : Industrial & Scientific
Bench Grinder Arbor Washer/Flange 1set OD2-1/10'' x ID 1/2'' & 1set OD3-1/10'' x ID 5/8'' for Grinding/Wire Wheel,2 Sets : Amazon.ca: Tools & Home Improvement
Arbor Bench Grinder Washers 3-3/8" OD x 1" ID | eBay