3M™ Retaining Ring is used to firmly hold spindle into shaft balancer assembly. For use with 3M™ Random Orbital Sanders with 3M™ Orbital Sanders.Genuine 3M Replacement Abrasive Power Tool Replacement Parts are engineered for your 3M Abrasive Power Tools. All replacement parts meet the same specifications and design criteria as the original components. You can be assured the replacement parts will fit, form, and function the same as or better than the original part, which will get your power tool back in action.