1/2" & 5/8" Tapered Spindle Adapter Threaded for Buffing Polishing Wheel for Bench Grinder Left and Right - 1 Pair - - Amazon.com
10mm Spindle Adapter For Polishing Machine Accessories Shaft Bench Grinder Grinding Wheel Connecting Rod - Polisher - AliExpress
Amazon.com: 5/8" Spindle Tapered Threaded Adapter Left & Right Pair Suitable for 3/16 Inch to 13/16 Inch Arbor Hole Cloth Polishing Wheel 2 : Industrial & Scientific