When you are annoyed about replacement shafts frequently to fit for different arbor hole of cotton polishing , this Spindle Tapered Threaded Adapter is your perfect tool, it can help you to fit the 3/16-10/16 inch arbor hole of cotton polishing , and it is easy to install, this Spindle Tapered Threaded Adapter is left and right pair, to meet the both sides of bench grinder.