Internal retaining ring used to keep the replaceable inner Uni-Ball bearing held firmly in place in our 1" Uni-Ball cup. Re-useable, but it is advisable to install a new one whenever you are replacing the inner bearing of the Uni-Ball.
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WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.