Du-Bro 3.17mm \/ 0.12" Dura-Collars (12 Pack) from Du-Bro - 597
These Dura-Collars have enough stock so that threads will not strip and can be reworked for many other uses. Includes set screw and one wrench.
Features:

Includes set screws and one wrench
Can be reworked for many other uses
Ample stock to work with, threads will not strip

 
  WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm.  For more information go to www.P65Warnings.ca.gov.